Add contributing.md (#12)

* Add contributing.md
- Closes #7

* Use proper tox commands

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+# Contributing
+
+All projects under the Pylons Project, including this one, follow the guidelines established at [How to Contribute](https://pylonsproject.org/community-how-to-contribute.html), [Coding Style and Standards](https://pylonsproject.org/community-coding-style-standards.html), and [Pylons Project Documentation Style Guide](https://docs.pylonsproject.org/projects/pastedeploy/).
+
+You can contribute to this project in several ways.
+
+*   [File an Issue on GitHub](https://github.com/Pylons/pastedeploy/issues)
+*   Fork this project, create a new branch, commit your suggested change, and push to your fork on GitHub.
+    When ready, submit a pull request for consideration.
+    [GitHub Flow](https://guides.github.com/introduction/flow/index.html) describes the workflow process and why it's a good practice.
+*   Join the [IRC channel #pyramid on irc.freenode.net](https://webchat.freenode.net/?channels=pyramid).
+
+
+## Running Tests and Building Docs
+
+Run `tox` from within your checkout. This will run the tests across all supported systems and attempt to build the docs.
+
+To run the tests for Python 3.7 only:
+
+    $ tox -e py37
+
+To build the docs:
+
+    $ tox -e docs
+
+See the `tox.ini` file for details.