docs: update readme

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Kat Inskip 2025-07-24 20:31:16 -07:00
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# katgba
Currently an example Rust game from the GBA crate, but with nix building.
## Usage
```
# Build rom
nix build .#katgba
# Use mgba-qt with a built rom
nix run .#katgba-emu
```