Added "work_flow.txt" which has a summary of how to interact with IPython github code.

work_flow.txt

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+IPython Development Workflow
+
+# Get a read only copy of the "master"
+git clone git://github.com/ipython/nbconvert.git
+
+# Add a copy of the master to your github account
+git remote add ocefpaf [e-mail]:ocefpaf/nbconvert.git
+
+# Start a new branch to work on
+git checkout -b your_new_branch
+
+# Push updates to your local branch to your github branch
+git push --set-upstream ocefpaf math_test:math_test
+
+( merging your updated github branch into the master is done via pull-request on the website)
+
+# Delete local branch
+git branch -d math_test
+
+# Delete remote branch
+git push ocefpaf :math_test
+