Add CONTRIBUTING.md

CONTRIBUTING.md

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+Contributing
+============
+
+Purpose
+-------
+
+First and foremost, slack-term is a personal project. With this project I
+never set out to create a "better" slack version than the official slack
+client. And as such, my intention for the project is not to create a feature
+complete alternative to the official slack client. It's cool that people 
+want to use slack-term as an alternative, but I started this project because
+I wanted to be able to send and receive slack messages from the terminal to
+slack.
+
+Issues
+------
+
+When posting issues please mention the following:
+
+* Which version of slack-term you're using
+* Method of installation (binary, go, or make)
+
+Feature requests
+----------------
+
+When creating an issue that is a feature request, I will label it as such,
+however this doesn't mean that it is an approved feature request. I will
+leave it open for discussion and decide whether it is feasible and/or
+desirable.
+
+Pull requests
+-------------
+
+Before creating a solution, please create an issue that is open for discussion
+first. This is to avoid dissappointment, for all the work you might have
+done, that might not get merged or needs to be refactored.