added an intro page

git-svn-id: https://svn.apache.org/repos/asf/maven/shared/trunk@1331979 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/site/apt/index.apt b/src/site/apt/index.apt
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+ -----
+ Maven Dependency Tree
+ -----
+ Hervé Boutemy
+ -----
+ 2012-04-29
+ -----
+
+Maven Dependency Tree
+
+  A tree-based API for resolution of Maven project dependencies.
+
+  Component entry point is <<<{{{./apidocs/org/apache/maven/shared/dependency/tree/DependencyTreeBuilder.html}DependencyTreeBuilder}}>>>.
+
+  Notice that this component actually only works with Maven 2 but computes wrong information with Maven 3:
+  see {{{http://jira.codehaus.org/browse/MSHARED-167}MSHARED-167}}.