Added CODE OF CONDUCT and CONTRIBUTING

Author: DavidJVitale

CODE_OF_CONDUCT.md

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+# Code of conduct
+
+**TL;DR**<br>
+We expect folks that participate in both our online and [IRL](www.urbandictionary.com/define.php?term=IRL) communities to be kind and considerate of others at all times.
+
+Esri's official CoC text can be found at http://www.esri.com/events/code-of-conduct

CONTRIBUTING.md

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+Esri welcomes contributions from anyone and everyone. Please see our [guidelines for contributing](https://github.com/esri/contributing).
+
+### Before filing an issue
+
+Please take a look at [previous issues](https://github.com/Esri/arcgis-python-api/issues?q=is%3Aissue+is%3Aclosed) that resolve common problems.
+
+If you're just looking for help, you'll probably attract the most eyes if you post in the [GeoNet Forums](https://community.esri.com/groups/arcgis-python-api/) or the [GIS Stackexchange](https://gis.stackexchange.com/questions/tagged/arcgis-python-api).
+
+If you think you're encountering a new bug, please feel free to log an [issue](https://github.com/Esri/arcgis-python-api/issues/new) and include the steps to reproduce the problem.
+
+**Please include the following in your issue:**
+* Your conda or pip environment (run `conda list` or `pip freeze` and copy/paste the output into the issue)
+* Any code (or notebook) you executed that made you run into this issue
+
+# Updating errors in existing notebooks
+
+Do you see an error in an existing notebook? Is there a typo, a misnamed variable, and do you know how to fix it?
+* Make the fix in the notebook
+* If you made code changes, re-run the appropriate cells in the notebook
+* Make a copy of the `dev_site_current` branch on your local fork
+* Add the updated notebook to your branch on your fork
+* [Open a pull request](https://help.github.com/articles/about-pull-requests/) from your fork's branch to this repository's `dev_site_current` branch
+
+# Adding new sample notebooks
+
+Do you have a notebook that shows off functionality of the API? Do you want to see that notebook released with the next version of the ArcGIS API for Python?
+* Create a new notebook, make sure it runs consistently on its own on a few systems
+    * Make sure the notebook filename is in an `all_lowercase_underscore_delimiter_convention.ipynb`
+* Make a copy of the `dev_site_next_release` branch on your local fork
+* Place the notebook in the correct folder in the `samples/` folder on your fork
+* Add the notebook to your branch on your fork
+* [Open a pull request](https://help.github.com/articles/about-pull-requests/) from your fork's branch to this repository's `dev_site_current` branch