Added content to basic developer quickstart.

DEVELOPMENT.rst

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+Developing on edx-sga
+==============================
+
+Setup
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+1. Install devstack [as described here](http://mitodl.github.io/edx-dev-intro-slides/#6), but don't ``paver run_all_servers`` yet.
+2. Instead, pip uninstall edx-sga (since it's part of the edx distribution, we have to remove the installed version)
+3. ``cd /edx/app/edxapp/themes/``
+4. Fork https://github.com/mitodl/edx-sga.git to your own github account.
+5. ``git clone https://github.com/your-name/edx-sga.git``
+
+6. ``cd edx-sga/``
+7. ``pip install -e .``
+8. ``paver run_all_servers``
+
+You should now see your fork of the most recent master branch of edx-sga running in the LMS.
+
+Developing
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+1. ``cd /edx/app/edxapp/themes/edx-sga/``
+2. ``git branch feature/your-name/name-of-feature``
+3. write code
+4. ``git add .``
+5. ``git commit -m "Description of feature added."``
+6. ``git push origin feature/your-name/name-of-feature``
+7. Rebase your branch against mitodl/master and resolve any conflicts.
+8. Open a pull request from your fork/feature branch to mitodl/master
+
+Also, see: [testing](https://github.com/mitodl/edx-sga#testing). Javascript testing will be added soon.