add contributing file

.github/CONTRIBUTING.md

@@ -0,0 +1,15 @@
+# CONTRIBUTING #
+
+## Bugs or feature requests
+
+* Submit an issue on the [Issues page](https://github.com/sckott/pygbif/issues) - be sure to include your Python version and pygbif version
+
+## Code formatting
+
+This project follows black. `pip install black`
+
+Run `black pygbif` before submitting a pull request to fix any formatting. `black --check pygbif` will tell you if there's suggested changes without performing those changes.
+
+## Code of conduct
+
+Contributors need to follow the [code of conduct](https://github.com/sckott/pygbif/blob/master/CONDUCT.md)

README.rst

@@ -14,6 +14,8 @@ Other GBIF clients:
 * Ruby: `gbifrb`, `sckott/gbifrb <https://github.com/sckott/gbifrb>`_
 * PHP: `php-gbif`, `restelae/php-gbif <https://gitlab.res-telae.cat/restelae/php-gbif>`_
 
+Contributing: `CONTRIBUTING.md <https://github.com/sckott/pygbif/blob/master/.github/CONTRIBUTING.md>`_
+
 Installation
 ============