Add readme

Author: florczakraf

README.md

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+# GTA III Radio For All Vehicles
+
+This repo contains code to build an ASI plugin that enables radio stations in all vehicles in GTA III.
+You can build it from source or download it from the Releases tab.
+
+## Installation
+
+Place the `gta-iii-radio-for-all-vehicles.asi` file inside `mss` directory in your GTA III install directory.
+
+## Supported Versions
+
+This code has been tested with the following English versions of the game: 1.0, 1.1, 1.1 Steam.
+
+## Thanks
+
+Thanks to ThirteenAG for the basic idea for the plugin (https://www.gtagarage.com/mods/show.php?id=23900).
+His version also allowed all vehicles to use Pay 'n' Spray which changes the gameplay.
+It also lacked the support for Steam version of the game.
+
+Also huge thanks to aquaz, halamix2 and pitpo for the support during the reversing & debugging session.