Create playtiles.md

Author: degliwe

thirdparty/playtiles.md

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+## Playtiles
+
+Third party consumer of the Homebrew Hub API. Entries marking `playtiles` in their `third-party` metadata field are allowing 'Playtiles' to re-distribute/embed the entry metadata and assets in their clients under the conditions listed in this page.
+
+Point of Contact: [Wes](mailto:inno.studio.fr@gmail.com) / [Playtiles website](https://get.playtil.es)
+
+Terms: Clients of the API will allow users to download ROMs for marked submissions into their iOS or Android device's local ROM library. The clients will also display metadata for apropriately marked submissions; including the provided screenshots, description, and licensing information.
+
+List of clients: PlaytilesOS progressive web app