Update README

README.md

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-# ddgo-converter
-Converter tool for PC versions of Densha de GO!
+# Densha de GO! Controller Converter
+
+This tool allows using a physical _Densha de GO!_ controller with a game that does not officially support it. It is Linux only (check https://autotraintas.hariko.com/ if you use Windows).
+
+## How it works
+
+The program reads input from a real controller, translates it and sends it to an emulated controller, which is picked up by the game.
+
+## Installation
+
+The executable is ready to use. However, you will need read AND write permissions on `/dev/uinput` for the program to work.
+
+**NOTE:** Currently, this fails to launch on the Steam Deck in Gaming Mode. It works fine in Desktop Mode, but you need to disable Steam Input (or close Steam entirely).
+
+## Supported controllers
+
+### Physical
+
+- One-handle controller for Nintendo Switch (ZKNS-001)
+
+### Emulated
+
+- Two-handle controller for PC (DGOC-44U)
+- Two-handle controller for Sony PlayStation (SLPH-00051)
+- Two-handle controller for Nintendo 64 (TCPP-20003)
+- Two-handle controller for SEGA Saturn (TC-5175290)
+
+## Notes
+
+When emulating console controllers, an emulated Sony PlayStation 3 controller is used for easier mapping. On RetroArch, everything works out of the box.
+
+_Densha de GO! 64_ requires connecting the controller to Port 3 and enabling **Independent C-button Controls**.