Started to rebuild TWBlue's documentation

documentation/source/credits.rst

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+Credits, contact and acknowledgments
+--------------------------------------
+
+Tw Blue is free software, licensed under the GNU GPL license, either version 2 or, at your option, any later version. You can view the license in the file named license.txt, or online at http://www.gnu.org/licenses/old-licenses/gpl-2.0.html.
+
+The source code of the program is available on GitHub at https://www.github.com/mcv-software/twblue.
+
+If you want to donate to the project, you can do so at https://twblue.es/donate. Thank you for your support!
+
+Contact
+========
+
+If you still have questions after reading this document, if you wish to collaborate to the project in some other way, or if you simply want to get in touch with the application developers, you can follow the accounts of TWBlue (`@tw_blue2 in Twitter <https://twitter.com/tw_blue2>`_ and `@twblue@maaw.social in mastodon <https://maaw.social/@twble>`_).
+
+Credits
+---------
+
+TWBlue is developed and maintained by `Manuel Cortéz <https://twitter.com/manuelcortez00>`_.
+
+We would also like to thank the translators of TWBlue, who have allowed the spreading of the application.