Create CONTRIBUTING.md

.github/CONTRIBUTING.md

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+Thanks for submitting an issue!
+
+* If this is a **feature request**, please make sure you explain the context, the goal, and why it is something that
+  would go into bonobo core. Drafting some bits of spec is a good idea too, even if it's very draft-y.
+* If this is a **bug report**, make sure you describe the expected and actual behaviour, eventually some minimal
+  code or steps to reproduce the problem.
+* If this is a **question**, please post it on slack overflow, and simply paste the question URL in an issue or in
+  the slack channel. Also, when you get an answer, please consider contributing back the bits of documentation you
+  would have loved to find in the first place.
+
+## Versions
+
+* Bonobo version:
+
+    `bonobo version --all`
+
+* Python version:
+
+    `python -c "import platform,sys; print(platform.python_implementation() + ' ' + sys.version)")`
+
+* Platform:
+
+    `uname -a`
+    `/etc/lsb-release`
+    ...
+