Add README.md and LICENSE

LICENSE

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+MIT License
+
+Copyright (c) 2019 Alice Gaudon
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Identity DB
+Updates your user's identities on login based on a custom database query.
+
+Currently supports 1 column query results (email addresses).
+
+## Configuration
+Copy config.inc.php.dist to config.inc.php (or `ln`) and follow instructions for each configuration value.
+
+## Contributing
+Feel free to make a pull request if you improve this plugin.
+
+You can include yourself in the author list of [composer.json](composer.json) or classes if you want, but you have to do it in your pull request. I won't add anyone to these lists by myself or accept requests/pull requests that only serve this purpose. 
+
+## License
+See [License file](LICENSE)