Adding a CONTRIBUTING.md document

Author: alanxz

CONTRIBUTING.md

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+Contributing to rabbitmq-c
+==========================
+
+Thanks for contributing to rabbitmq-c. I firmly believe that participation helps
+make open source software great. With that there are a few things that can be
+done to make our interaction a bit smoother.
+
+Please use the following guidelines when creating an issue or submitting a 
+pull request
+
+Creating an issue
+-----------------
+When submitting an issue its helpful to know the following
+ - What version of rabbitmq-c are you using?
+ - What operating system and version are you running on?
+ - What compiler and version are you running?
+ -
+ - If its a build system issue: which build system are you using (
+
+
+Submitting a pull-request
+-------------------------
+I love to get code contributions, a few things that can help out:
+ - Make sure your commits are rebased on the current master branch
+ - Please collapse your commits down to a couple logical commits
+