Adding contributing.md first draft (tableau#48)

* Adding contributing.md first draft

* Adding information about Issues, Feature requests, and PRs
Based on feedback from @lbrendanl

* Adding additional detail to the the feature PR section
based on feedback from @benlower

* fixing typo

contributing.md

@@ -0,0 +1,33 @@
+# Contributing
+
+We welcome contributions to this project!
+
+Contribution can include, but are not limited to, any of the following:
+
+* File an Issue
+* Request a Feature
+* Implement a Requested Feature
+* Fix an Issue/Bug
+* Add/Fix documentation
+
+Contributions must follow the guidelines outlined on the [Tableau Organization](http://tableau.github.io/) page, though filing an issue or requesting
+a feature do not require the CLA.
+
+## Issues and Feature Requests
+
+To submit an issue/bug report, or to request a feature, please submit a [github issue](https://github.com/tableau/document-api-python/issues) to the repo.
+
+If you are submiting a bug report, please provide as much information as you can, including clear and concise repro steps, attaching any necessary
+files to assist in the repro.  **Be sure to scrub the files of any potentially sensitive information.  Issues are public.**
+
+For a feature request, please try to describe the scenario you are trying to accomplish that requires the feature.  This will help us understand
+the limitations that you are running into, and provide us with a use case to know if we've satisfied your request.
+
+## Fixes, Implementations, and Documentation
+
+For all other things, please submit a PR that includes the fix, documentation, or new code that you are trying to contribute.  More information on
+creating a PR can be found in the [github documentation](https://help.github.com/articles/creating-a-pull-request/)
+
+If the feature is complex or has multiple solutions that could be equally appropriate approaches, it would be helpful to file an issue to discuss the
+design trade-offs of each solution before implementing, to allow us to collectively arrive at the best solution, which most likely exists in the middle
+somewhere.