added link to Package Building Examples repo

Author: jimkring

docs/building-packages/index.md

@@ -1,3 +1,5 @@
 # Building Packages
 
 This section includes information about package building. Expand the tree (left sidebar) to see the various topics (sub-sections).
+
+Also, check out the [VIPM Package Building Example Projects](https://github.com/vipm-io/examples-vipm-package-building/) repository for some useful examples, tools, and techniques related to building VI packages.