Adding Contribution Guidelines to Tornado Web Server

CONTRIBUTING.md

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+Contributing to Tornado Web Server
+================== 
+
+Tornado Web Server is an open source Python web framework and asynchronous networking library, originally developed at FriendFeed.
+
+Tornado is driven by it's community and contributions are welcome. 
+
+Before contributing, here are some steps to follow:
+
+Bug Reports
+------------
+
+When submitting a bug report:
+
+1. Check the existing `issues <https://github.com/tornadoweb/tornado/issues>`_ to ensure it hasn't already been brought up/there isn't already a fix being worked on
+
+2. If there is no existing issue, attempt to reproduce the bug and record your steps. Be as specific as possible
+
+3. Open a new `issue here <https://github.com/tornadoweb/tornado/issues/new>`__ 
+
+4. Give a descriptive name of the issue caused by the bug and be as descriptive as possible when describing what the bug is doing and what steps you took to get there
+
+
+Submitting Code
+------------
+
+When working on submitting new code to the repository:
+
+1. Fork the repository to create your own version to work on
+
+2. When ready to submit, if you had an open issue/we working on an existing issue please comment on the issue to state you are making a merge request
+
+3. Create a new pull request with detailed comments about what you are changing and why
+
+4. If your pull request is not merged, look for followup comments for what needs to be changed for it to make it into the master repository
+
+
+If New: Familiarizing Yourself with Tornado
+------------
+
+- `Documentation <http://www.tornadoweb.org>`__
+- `Mailing Lists: Discussions <https://groups.google.com/forum/#!forum/python-tornado>`__
+- `Mailing Lists: Announcements <https://groups.google.com/forum/#!forum/python-tornado-announce>`__
+- `README <https://github.com/tornadoweb/tornado/blob/master/README.rst>`__
+- `Tornado Wiki <https://github.com/tornadoweb/tornado/wiki>`__
+