Added contributing information for people new to github

Author: sconix

CONTRIBUTING.md

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+# Contributing guide
+
+Want to contribute to this project? Awesome! There are many ways you can contribute, see below.
+
+### Opening issues
+
+Open an issue to report bugs or to propose new features. If you have a general usage question please note that this is just a wrapper and most questions should be directed to the actual library in Stack Overflow etc.
+
+### Proposing pull requests
+
+Pull requests are more than welcome. Note that if you are going to propose drastic changes or new features, be sure to open an issue for discussion first, to make sure that your PR will be accepted before you spend effort coding it.