add CONTRIBUTING.md

.github/CONTRIBUTING.md

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+# Contributing to Conda
+
+:+1::tada: First off, thanks for taking the time to conda! :tada::+1:
+
+## New Issues
+
+If your issue is a bug report or feature request for:
+
+* **a specific conda package**: please file it at <https://github.com/ContinuumIO/anaconda-issues/issues>
+* **anaconda.org**: please file it at <https://github.com/Anaconda-Platform/support/issues>
+* **repo.continuum.io**: please file it at <https://github.com/ContinuumIO/anaconda-issues/issues>
+* **commands under `conda build`**: please file it at <https://github.com/conda/conda-build/issues>
+* **commands under `conda env`**: please file it here!
+* **all other conda commands**: please file it here!