Create README.md

README.md

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+# GameBoy++
+## Limitations and Features
+
+Currently supports 32 KiB roms and MBC1 roms.
+Currently passes [dmg-acid2](https://github.com/mattcurrie/dmg-acid2?tab=readme-ov-file), [blargg's cpu_instrs test](https://github.com/retrio/gb-test-roms/tree/master/cpu_instrs), and the [jsmoo SM83 JSON tests](https://github.com/raddad772/jsmoo-json-tests/tree/main/tests/sm83)
+
+Tested running Super Mario Land, Dr Mario and Tetris.
+Does not currently support MBC3 (needed for games like Pokemon) or loading saves. Some MBC1 games have issues still.
+
+## Building
+`mkdir build && cd build`
+`cmake ..`
+`./GameBoy++ <bios> <rom>`
+
+## Controls
+WASD is mapped to the d-pad
+K and L are mapped to A and B
+O and P are mapped to select and start