This part was not in sync with dev docs, should have been cherry-picked.

docs/src/dev/index.html

@@ -48,6 +48,16 @@ <h2>Developer Resources (2.6)</h2>
     of praise and encouragement you can handle :-)
 </p>
 
+<p>
+    The best place to "dive in" to working with Nimbus (whether it be to
+    contribute something or to customize something for your own purpose) is
+    by learning to run the <a href="testing.html">test suites</a>.
+    Run some of the unit suites.  Change
+    some behavior and run them again and see what happens.  Try it with the
+    debugger and step through how some of the code flows.  Make a quick
+    contribution by writing a new test!
+</p>
+
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