add CONTRIBUTING

following github rules. Keeping it small and english only.
links to main website.

diff --git a/CONTRIBUTING.rst b/CONTRIBUTING.rst
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+============
+Contributing
+============
+
+
+Even when you think you can't help, you can.
+
+**See `Contribute to Galette <https://galette.eu/site/contribute/>`_**.
+
+You can Use, Test and Report:
+-----------------------------
+
+- You can use the regular `Galette` for your own needs,
+
+- You can test new features, or regularly try the `nightly version 
+  <http://download.tuxfamily.org/galette/galette-dev.tar.bz2>`_,
+
+- If you encouter a bug, you should open a ticket on the `Galette tracker 
+  <https://bugs.galette.eu/projects/galette>`_, with as much informations as
+  you can (helpfull enough to a developper to understand, even reproduce this bug),
+  See `<https://doc.galette.eu/en/master/faq/index.html#how-to-report-a-bug-or-ask-for-a-feature>`_,
+
+- Use one of many communication channels, see `<https://galette.eu/site/contact/>`_, 
+  to reach us.
+
+You can Help, Communicate and Advertise:
+----------------------------------------
+
+- You can help others (or get help for yourself) on our mailing-lists, see 
+  `<https://galette.eu/site/contact/>`_,
+
+- You can talk or write about `Galette` on your social networks, during your 
+  LUG meetings or else.
+
+
+You can Donate:
+---------------
+
+Johan, the main `Galette` developper, never say *no* to a little motivation.
+
+You can Translate:
+------------------
+
+This is a very usefull contribution. See `<https://galette.eu/site/contribute/#translate>`_ for more.
+
+You can Hack, Fix and Code:
+---------------------------
+
+These are the more technical contributions. Please read our `Developer Guide 
+<https://doc.galette.eu/en/develop/development/>`_.