Create contributing.md

Author: pydanny

contributing.md

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+Before You Submit an Issue
+----------------------------
+
+* Be nice. :-)
+* Be honest.
+* Check the other issues in [open](https://github.com/twoscoops/Creating-and-Distributing-Python-Packages?state=open) and [closed](https://github.com/twoscoops/Creating-and-Distributing-Python-Packages/issues?state=closed) to see if your issue already exists.
+* Please, please, please identify each issue by chapter and section number. 
+* For tracking and credit purposes, **each request for correction needs to be in it's own issue. If an issue contains 2 or more issues, we'll close it with a request for breaking up into more atomic issues.**