MINDEXER-91: Add a Spring based example

Added directory structures.
diff --git a/indexer-examples/indexer-examples-basic/pom.xml b/indexer-examples/indexer-examples-basic/pom.xml
new file mode 100644
index 0000000..11d44cb
--- /dev/null
+++ b/indexer-examples/indexer-examples-basic/pom.xml
@@ -0,0 +1,117 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <parent>
+    <groupId>org.apache.maven.indexer</groupId>
+    <artifactId>maven-indexer</artifactId>
+    <version>6.0-SNAPSHOT</version>
+  </parent>
+
+  <artifactId>indexer-examples-basic</artifactId>
+
+  <name>Maven :: Indexer Examples [Basic]</name>
+  <description>
+    This module contains Maven Indexer basic usage examples.
+  </description>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-surefire-plugin</artifactId>
+        <configuration>
+          <skipTests>true</skipTests>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+
+  <!-- IMPORTANT! * WHEN YOU CHANGE DEPS MAKE SURE TO UPDATE SHADE CONFIG! * DON'T FORGET OTHERWISE YOU ARE RENDERING CLI
+    UNWORKABLE! -->
+
+  <dependencies>
+      <!-- For search app in general -->
+      <dependency>
+        <groupId>org.slf4j</groupId>
+        <artifactId>slf4j-api</artifactId>
+        <scope>compile</scope>
+      </dependency>
+
+      <dependency>
+        <groupId>org.apache.maven.indexer</groupId>
+        <artifactId>indexer-core</artifactId>
+        <version>6.0-SNAPSHOT</version>
+        <scope>compile</scope>
+      </dependency>
+
+      <!-- For ResourceFetcher implementation, if used -->
+      <dependency>
+        <groupId>org.apache.maven.wagon</groupId>
+        <artifactId>wagon-http-lightweight</artifactId>
+        <version>2.3</version>
+        <scope>compile</scope>
+      </dependency>
+
+      <!-- Runtime: DI, but using Plexus Shim as we use Wagon -->
+      <dependency>
+        <groupId>org.eclipse.sisu</groupId>
+        <artifactId>org.eclipse.sisu.plexus</artifactId>
+      </dependency>
+      <dependency>
+        <groupId>org.sonatype.sisu</groupId>
+        <artifactId>sisu-guice</artifactId>
+      </dependency>
+
+      <!-- Test -->
+      <dependency>
+        <groupId>junit</groupId>
+        <artifactId>junit</artifactId>
+        <scope>test</scope>
+      </dependency>
+      <dependency>
+        <groupId>org.slf4j</groupId>
+        <artifactId>slf4j-simple</artifactId>
+        <scope>test</scope>
+      </dependency>
+  </dependencies>
+
+  <profiles>
+    <profile>
+      <id>examples</id>
+      <activation>
+        <activeByDefault>false</activeByDefault>
+      </activation>
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-surefire-plugin</artifactId>
+            <configuration>
+              <skipTests>false</skipTests>
+            </configuration>
+          </plugin>
+        </plugins>
+      </build>
+    </profile>
+  </profiles>
+
+</project>
diff --git a/indexer-examples/indexer-examples-spring/pom.xml b/indexer-examples/indexer-examples-spring/pom.xml
new file mode 100644
index 0000000..6e3100b
--- /dev/null
+++ b/indexer-examples/indexer-examples-spring/pom.xml
@@ -0,0 +1,164 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+
+  <modelVersion>4.0.0</modelVersion>
+
+  <parent>
+    <groupId>org.apache.maven.indexer</groupId>
+    <artifactId>maven-indexer</artifactId>
+    <version>6.0-SNAPSHOT</version>
+  </parent>
+
+  <artifactId>indexer-examples-spring</artifactId>
+
+  <name>Maven :: Indexer Examples [Spring]</name>
+  <description>
+    This module contains Maven Indexer usage examples for integration with Spring.
+  </description>
+
+  <properties>
+    <version.spring>4.0.6.RELEASE</version.spring>
+  </properties>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-surefire-plugin</artifactId>
+        <configuration>
+          <skipTests>true</skipTests>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+
+  <dependencies>
+      <!-- For search app in general -->
+      <dependency>
+        <groupId>org.slf4j</groupId>
+        <artifactId>slf4j-api</artifactId>
+        <scope>compile</scope>
+      </dependency>
+      <dependency>
+        <groupId>ch.qos.logback</groupId>
+        <artifactId>logback-classic</artifactId>
+        <scope>test</scope>
+      </dependency>
+      <dependency>
+        <groupId>ch.qos.logback</groupId>
+        <artifactId>logback-core</artifactId>
+        <scope>test</scope>
+      </dependency>
+      <dependency>
+        <!-- This dependency is required in order to intercept Spring logging and handle it through Logback + SLF4J,
+             as it would otherwise use commons-logging and do it's own other thing. -->
+        <groupId>org.slf4j</groupId>
+        <artifactId>jcl-over-slf4j</artifactId>
+        <scope>test</scope>
+      </dependency>
+
+      <dependency>
+        <groupId>org.apache.maven.indexer</groupId>
+        <artifactId>indexer-core</artifactId>
+        <version>6.0-SNAPSHOT</version>
+        <scope>compile</scope>
+      </dependency>
+
+      <dependency>
+          <groupId>org.apache.maven</groupId>
+          <artifactId>maven-model-builder</artifactId>
+          <version>3.2.3</version>
+          <scope>test</scope>
+      </dependency>
+
+      <!-- For ResourceFetcher implementation, if used -->
+      <dependency>
+        <groupId>org.apache.maven.wagon</groupId>
+        <artifactId>wagon-http-lightweight</artifactId>
+        <version>2.3</version>
+        <scope>compile</scope>
+      </dependency>
+
+      <!-- Runtime: DI, but using Plexus Shim as we use Wagon -->
+      <dependency>
+        <groupId>org.eclipse.sisu</groupId>
+        <artifactId>org.eclipse.sisu.plexus</artifactId>
+      </dependency>
+      <dependency>
+        <groupId>org.sonatype.sisu</groupId>
+        <artifactId>sisu-guice</artifactId>
+      </dependency>
+
+      <!-- Spring dependencies start: -->
+      <dependency>
+          <groupId>org.springframework</groupId>
+          <artifactId>spring-beans</artifactId>
+          <version>${version.spring}</version>
+      </dependency>
+      <dependency>
+          <groupId>org.springframework</groupId>
+          <artifactId>spring-context</artifactId>
+          <version>${version.spring}</version>
+      </dependency>
+      <dependency>
+          <groupId>org.springframework</groupId>
+          <artifactId>spring-core</artifactId>
+          <version>${version.spring}</version>
+      </dependency>
+      <dependency>
+          <groupId>org.springframework</groupId>
+          <artifactId>spring-test</artifactId>
+          <version>${version.spring}</version>
+          <scope>test</scope>
+      </dependency>
+      <!-- Spring dependencies end. -->
+
+      <!-- Test -->
+      <dependency>
+        <groupId>junit</groupId>
+        <artifactId>junit</artifactId>
+        <scope>test</scope>
+      </dependency>
+  </dependencies>
+
+  <profiles>
+    <profile>
+      <id>examples</id>
+      <activation>
+        <activeByDefault>false</activeByDefault>
+      </activation>
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-surefire-plugin</artifactId>
+            <configuration>
+              <skipTests>false</skipTests>
+            </configuration>
+          </plugin>
+        </plugins>
+      </build>
+    </profile>
+  </profiles>
+
+</project>