Add module graph plugin and expose the graph in the README

tools/docs/generateModuleGraph.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+## Dependency graph https://github.com/savvasdalkitsis/module-dependency-graph
+dotPath=`pwd`/docs/images/module_graph.dot
+pngPath=`pwd`/docs/images/module_graph.png
+./gradlew graphModules -PdotFilePath=${dotPath} -PgraphOutputFilePath=${pngPath} -PautoOpenGraph=false
+rm ${dotPath}