Add contributors documentations

docs/contributors/memo.rst

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+Before requesting a pull
+========================
+
+Update translations
+-------------------
+
+Mailu uses Babel for internationalization and localization. Before any
+of your work is merged, you must make sure that your strings are internationalized
+using Babel.
+
+If you used ``_``, ``{% trans %}`` and other Babel syntaxes in your code, run the
+following command to update the POT file:
+
+.. code-block:: bash
+
+  pybabel extract -F babel.cfg -k lazy_gettext -o messages.pot mailu
+
+The, update the translations:
+
+.. code-block:: bash
+
+  pybabel update -i messages.pot -d mailu/translations
+
+Please resolve fuzzy strings to the best of your knowledge.
+
+Update information files
+------------------------
+
+If you added a feature or fixed a bug or committed anything that is worth mentionning
+for the next upgrade, add it in the ``CHANGELOG.md`` file.
+
+Also, if you would like to be mentionned by name or add a comment in ``AUTHORS.md``,
+feel free to do so.