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+*****************
+How to contribute
+*****************
+
+So you want to contribute to the Powerline project? Awesome! This document 
+describes the guidelines you should follow when making contributions to the 
+project.
+
+**Please note that these guidelines aren't mandatory in any way, but your 
+pull request will be merged a lot faster if you follow them.**
+
+Getting started
+===============
+
+* Make sure you have a `GitHub account <https://github.com/signup/free>`_.
+* Submit an `issue on GitHub <https://github.com/powerline/powerline/issues>`_, 
+  assuming one does not already exist.
+
+  * Clearly describe the issue.
+  * If the issue is a bug: make sure you include steps to reproduce, and 
+    include the earliest revision 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.
+
+  * Powerline uses the `Git Flow 
+    <http://nvie.com/posts/a-successful-git-branching-model/>`_ branching 
+    model.
+  * Most contributions should be based off the ``develop`` branch.
+  * Prefix your branch with ``feature/`` if you're working on a new feature.
+  * Include the issue number in your topic branch, e.g.  
+    ``321-fix-some-error`` or ``feature/123-a-cool-feature``.
+
+* Make commits of logical units.
+* Run your code through ``flake8`` and fix any programming style errors. Use 
+  common sense regarding whitespace warnings, not all warnings need to be 
+  fixed.
+* Make sure your commit messages are in the `proper format 
+  <http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html>`_.  
+  The summary must be no longer than 70 characters. Refer to any related 
+  issues with e.g. ``Ref #123`` or ``Fixes #234`` at the bottom of the 
+  commit message. Commit messages can use Markdown with the following 
+  exceptions:
+
+  * No HTML extensions.
+  * Only indented code blocks (no ``````` blocks).
+  * Long links should be moved to the bottom if they make the text wrap or 
+    extend past 72 columns.
+
+* Make sure you have added the necessary tests for your changes.
+* Run *all* the tests to assure nothing else was accidentally broken.
+
+Programming style
+-----------------
+
+* The project uses *tabs for indentation* and *spaces for alignment*, this 
+  is also included in a vim modeline on top of every script file.
+* Run your code through ``flake8 --ignore=W191,E501,E128,W291,E126,E101`` to fix 
+  any style errors. Use common sense regarding whitespace warnings, not all 
+  ``flake8`` warnings need to be fixed.
+* Trailing whitespace to indicate a continuing paragraph is OK in comments, 
+  documentation and commit messages.
+* It is allowed to have too long lines. It is advised though to avoid lines 
+  wider then a hundred of characters.
+* Imports have the following structure:
+
+  1. Shebang and modeline in a form
+
+     .. code-block:: python
+
+         #!/usr/bin/env python
+         # vim:fileencoding=utf-8:noet
+
+     . Modeline is required, shebang is not. If shebang is present file must end 
+     with
+
+     .. code-block:: python
+
+        if __name__ == '__main__':
+            # Actual script here
+
+  2. Module docstring.
+  3. ``__future__`` import exactly in a form
+
+     .. code-block:: python
+
+         from __future__ import (unicode_literals, division, absolute_import, print_function)
+
+     (powerline.shell is the only exception due to problems with argparse). It 
+     is not separated by newline with shebang and modeline, but is with 
+     docstring.
+  4. Standard python library imports in a form ``import X``.
+  5. Standard python library imports in a form ``from X import Y``.
+  6. Third-party (non-python and non-powerline) library imports in a form 
+     ``import X``.
+  7. Third-party library imports in a form ``from X import Y``.
+  8. Powerline non-test imports in a form ``from powerline.X import Y``.
+  9. Powerline test imports in a form ``import tests.vim as vim_module``.
+  10. Powerline test imports in a form ``from tests.X import Y``.
+
+  Each entry is separated by newline from another entry. Any entry except for 
+  the first and third ones is optional. Example with all entries:
+
+  .. code-block:: python
+
+    #!/usr/bin/env python
+    # vim:fileencoding=utf-8:noet
+
+    '''Powerline super module'''
+
+    from __future__ import (unicode_literals, division, absolute_import, print_function)
+
+    import sys
+
+    from argparse import ArgumentParser
+
+    import psutil
+
+    from colormath.color_diff import delta_e_cie2000
+
+    from powerline.lib.unicode import u
+
+    import tests.vim as vim_module
+
+    from tests import TestCase
+
+Submitting changes
+==================
+
+* Push your changes to a topic branch in your fork of the repository.
+* If necessary, use ``git rebase -i <revision>`` to squash or reword commits
+  before submitting a pull request.
+* Submit a pull request to `powerline repository 
+  <https://github.com/powerline/powerline>`_.