Update CONTRIBUTING.md

Author: coreybutler

CONTRIBUTING.md

@@ -3,3 +3,7 @@
 There have been a lot of duplicate issues filed. Please do a simple search for your issue before posting something new.
 
 If you just have a question and no real problem, please use the [StackOverflow tag](https://stackoverflow.com/questions/tagged/nvm-windows) the [Gitter channel](https://gitter.im/coreybutler/nvm-windows) instead of clogging up the bug tracker with questions.
+
+## Common Issues & Resolutions
+
+See the [Common Issues](https://github.com/coreybutler/nvm-windows/wiki/Common-Issues) wiki page before submitting.