[MSHARED-562] added documentation on the styled message API
git-svn-id: https://svn.apache.org/repos/asf/maven/shared/trunk@1752880 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/maven-shared-utils/src/main/java/org/apache/maven/shared/utils/logging/package-info.java b/maven-shared-utils/src/main/java/org/apache/maven/shared/utils/logging/package-info.java
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--- /dev/null
+++ b/maven-shared-utils/src/main/java/org/apache/maven/shared/utils/logging/package-info.java
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+// CHECKSTYLE_OFF: RegexpHeader
+/*
+ * 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.
+ */
+/**
+ * An API to write Maven messages to console with styled color content, consistently across whole
+ * Maven ecosystem (Maven itself or any plugin or extension).
+ * <p>
+ * Messages are built with instances of {@link org.apache.maven.shared.utils.logging.MessageBuffer MessageBuffer}
+ * which provides a fluent API.
+ * {@link org.apache.maven.shared.utils.logging.MessageUtils MessageUtils} gives access to these buffers.
+ * <p>
+ * Plugins can use this API with any Maven version: color
+ * just won't be activated when run with Maven version older than 3.4.0.
+ * <p>
+ * Styles are:<ul>
+ * <li><code>debug</code>, <code>info</code>, <code>warning</code> and <code>error</code> for slf4j level display,</li>
+ * <li><code>success</code>, <code>failure</code>, <code>strong</code>, <code>mojo</code> and <code>project</code> for
+ * message content</li>
+ * </ul>
+ * Default styles colors can be configured through system properties, that can be set in <code>MAVEN_OPTS</code>
+ * environment variable (eventually in <code>.mavenrc</code> script):<ul>
+ * <li>system properties are named <code>style.<style name></code>,</li>
+ * <li>values are comma separated combination of <code>bold</code>, <code><color></code> and
+ * <code>bg<color></code> (for background), where <code><color></code> is
+ * an <a href="https://en.wikipedia.org/wiki/ANSI_escape_code#Colors">ANSI color</a>: <code>black</code>,
+ * <code>red</code>, <code>green</code>, <code>yellow</code>, <code>blue</code>, <code>magenta</code>,
+ * <code>cyan</code> or <code>white</code>, eventually with <code>bright</code> prefix</li>
+ * </ul>
+ */
+package org.apache.maven.shared.utils.logging;
+