[Example] Add example bundle for built-ins

Add bundle which will serve as an example of how to
declare the presence of Angular built-ins as extensions
which will be recognized by the framework layer.

Also useful for generally verifying that functionality
provided by framework layer provides sufficient support
for other bundles to expose application features.
WTD-518.

example/builtins/res/templates/example.html

@@ -0,0 +1 @@
+<p>Hello, world! I am the default route.</p>