Create CONTRIBUTING.md

Author: lisachenko

CONTRIBUTING.md

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+How to contribute
+=================
+
+We love pull requests. Here's a quick guide:
+
+Getting Started
+---------------
+
+-  Make sure you have a [GitHub account](https://github.com/signup/free)
+-  Submit a ticket for your issue, assuming one does not already exist.
+-  Clearly describe the issue including steps to reproduce when it is a bug.
+-  Make sure you fill in the earliest version that you know has the issue.
+-  Fork the repository on GitHub
+
+Making Changes
+--------------
+
+-  Create a topic branch from where you want to base your work.
+-  This is usually the master branch.
+-  Only target release branches if you are certain your fix must be on
+   that branch.
+-  To quickly create a topic branch based on master;
+   ``git branch fix/master/my_contribution master`` then checkout
+   the new branch with ``git checkout fix/master/my_contribution``.
+   Please avoid working directly on the ``master`` branch.
+-  Make commits of logical units.
+-  Check for unnecessary whitespace with ``git diff --check`` before
+   committing.
+-  Make sure your commit messages are in the proper format.
+
+
+        Make the example in CONTRIBUTING imperative and concrete
+
+        Without this patch applied the example commit message in the CONTRIBUTING
+        document is not a concrete example.  This is a problem because the
+        contributor is left to imagine what the commit message should look like
+        based on a description rather than an example.  This patch fixes the
+        problem by making the example concrete and imperative.
+
+        The first line is a real life imperative statement with a ticket number
+        from our issue tracker.  The body describes the behavior without the patch,
+        why this is a problem, and how the patch fixes the problem when applied.
+
+
+-  Make sure you have added the necessary tests for your changes.
+-  Run *all* the tests to assure nothing else was accidentally broken.
+
+Submitting Changes
+------------------
+
+-  Push your changes to a topic branch in your fork of the repository.
+-  Submit a pull request to the repository.
+
+Additional Resources
+====================
+
+-  [General GitHub documentation](https://help.github.com)
+-  [GitHub pull request
+   documentation](https://help.github.com/articles/about-pull-requests)