Merge pull request #30 from SparkPost/contributing

Create CONTRIBUTING file

CONTRIBUTING.md

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+# Contributing to python-sparkpost
+
+Transparency is one of our core values, and we encourage developers to contribute and become part of the SparkPost developer community.
+
+The following is a set of guidelines for contributing to python-sparkpost,
+which is hosted in the [SparkPost Organization](https://github.com/sparkpost) on GitHub.
+These are just guidelines, not rules, use your best judgment and feel free to
+propose changes to this document in a pull request.
+
+## Submitting Issues
+
+* You can create an issue [here](https://github.com/sparkpost/python-sparkpost/issues/new), but
+  before doing that please read the notes below on debugging and submitting issues,
+  and include as many details as possible with your report.
+* Include the version of python-sparkpost you are using.
+* Perform a [cursory search](https://github.com/issues?utf8=%E2%9C%93&q=is%3Aissue+user%3Asparkpost+repo%3Apython-sparkpost)
+  to see if a similar issue has already been submitted.
+
+## Local development
+
+* Fork this repository
+* Clone your fork
+* Install virtualenv: ``pip install virtualenv``
+* Run ``make install``
+* Run ``source venv/bin/activate``
+* Write code!
+
+## Contribution Steps
+
+### Guidelines
+
+- Provide documentation for any newly added code.
+- Provide tests for any newly added code.
+- Follow PEP8.
+
+1. Create a new branch named after the issue you’ll be fixing (include the issue number as the branch name, example: Issue in GH is #8 then the branch name should be ISSUE-8)) 
+2. Write corresponding tests and code (only what is needed to satisfy the issue and tests please)
+    * Include your tests in the 'test' directory in an appropriate test file
+    * Write code to satisfy the tests
+3. Ensure automated tests pass
+4. Submit a new Pull Request applying your feature/fix branch to the develop branch
+
+## Testing
+
+Once you are set up for local development:
+
+* Run ``make test`` to test against your current Python environment
+* Open htmlcov/index.html to view coverage information