Added link to the jMonkeyStore.

src/docs/asciidoc/documentation.adoc

@@ -101,7 +101,7 @@ Are you an experienced Java developer who wants to add new features or contribut
 *  <<jme3/jme3_source_structure#,Learn about the source structure>>
 *  <<sdk#development,Write jMonkeyEngine SDK plugins and visual editors>>
 *  <<report_bugs#,Report bugs and submit patches>>
-
+* link:https://jmonkeystore.com/[Find assets on the community supported jMonkeyStore]
 
 == Contact