Add rudimentary README.md

Author: VinVel

README.md

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+# UnifiedContacts
+
+This app is still in development and currently unusable. Come back later
+
+## License
+```
+UnifiedContacts, an Android contacts managing app.
+Copyright (C) 2026 VinVel
+
+This Source Code Form is subject to the terms of the Mozilla 
+Public License, v. 2.0. If a copy of the MPL was not distributed 
+with this file, You can obtain one at 
+https://mozilla.org/MPL/2.0/.
+
+This Source Code Form is “Incompatible With Secondary Licenses”, 
+as defined by the Mozilla Public License, v. 2.0.
+```