Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+### Users can contribute to this repository in a variety of ways:
+
+#### Have a feature you want implemented?
+
+  Open an [issue](https://github.com/s4w3d0ff/python-poloniex/issues) stating what feature you wish to implement, [pull requests](https://github.com/s4w3d0ff/python-poloniex/pulls) are encouraged and will speed up the implication.   
+
+#### Found a bug that needs fixing?
+
+  If you know how to fix it, a [pull requests](https://github.com/s4w3d0ff/python-poloniex/pulls) is encouraged, otherwise open an issue and provide details on the events leading up to the bug, and include a traceback of the error.  
+
+#### Want to improve documentation?
+
+  Take a look at the [Wiki](https://github.com/s4w3d0ff/python-poloniex/wiki) and docstrings. Improvement is always welcome.
+
+#### Want to just show support?
+
+  You can simply star/fork [this repository at gihhub.com](https://github.com/s4w3d0ff/python-poloniex/), and/or donate to the following:
+
+  BTC: `1A7K4kgXLSSzvDRjvoGwomvhrNU4CKezEp`