Merge pull request 'Add README' (#6) from ooguz/Adunatio:master into master

Reviewed-on: #6

README.md

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+# Adunatio
+
+Association software by [Özgür Yazılım Derneği](https://oyd.org.tr)
+
+### Dev install   
+
+```bash
+# clone the repository and get submodules
+git clone https://git.oyd.org.tr/oyd/Adunatio.git
+cd Adunatio
+git submodule init
+git submodule update
+docker-compose -f docker-compose-dev.yaml up
+```
+
+You can access Adunatio from <http://localhost:5000> 
+
+### License
+
+Copyright (C) 2021 Özgür Yazılım Derneği
+
+This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.