Add readme and contributing guide (#83)

Author: Rangi42

CONTRIBUTING.md

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+# Contributing
+
+Contributions are welcome! Feel free to open an issue or even a pull request.
+
+## Adding a new emulator
+
+To add a new emulator:
+
+1. Create a new file in `emulators/` implementing the base emulator interface.
+2. Add the emulator specification to `EMULATOR_SPECS` in `main.py`.
+3. Implement the required methods: `setup()`, `run()`, `undoSetup()`.
+
+An example emulator specification:
+
+```python
+{
+    'factory': lambda: _new_instance("emulators.myemu", "MyEmulator"),
+    'keywords': ["MyEmulator", "myemu"],
+    'name': "MyEmulator",
+    'url': "https://myemulator.example.com/",
+}
+```

README.md

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+# GB Emulator Shootout 🎮🔫
+
+GBEmulatorShootout is an automated test comparison project for Game Boy emulators. It runs a suite of accuracy test ROMs across a set of Game Boy emulators and publishes the pass/fail results as a comprehensive table, with screenshots for each test case.
+
+The table of results can be generated locally, but we also regularly update it at https://gbdev.io/GBEmulatorShootout/.
+
+If you'd like to contribute to the project, please read [CONTRIBUTING.md](CONTRIBUTING.md).
+
+## Test suites
+
+- [Blargg's tests](https://github.com/retrio/gb-test-roms)
+- [Gekkio](https://github.com/Gekkio)'s [Mooneye test suite](https://github.com/Gekkio/mooneye-test-suite)
+- [Matt Currie](https://github.com/mattcurrie)'s Game Boy acid tests ([dmg-acid2](https://github.com/mattcurrie/dmg-acid2), [cgb-acid2](https://github.com/mattcurrie/cgb-acid2), and [cgb-acid-hell](https://github.com/mattcurrie/cgb-acid-hell))
+- [Lior Halphon (LIJI32)](https://github.com/LIJI32)'s [SameSuite tests](https://github.com/LIJI32/SameSuite)
+- [ax6](https://github.com/aaaaaa123456789)'s [MBC3 RTC tests](https://github.com/aaaaaa123456789/rtc3test)
+- [daid's tests](https://github.com/gbdev/GBEmulatorShootout/tree/main/testroms/daid)
+- [Ashiepaws](https://github.com/Ashiepaws)' tests ([Bully](https://github.com/Ashiepaws/BullyGB) and [Strikethrough](https://github.com/Ashiepaws/strikethrough.gb))
+- [Matt Currie](https://github.com/mattcurrie)'s [Mealybug Tearoom tests](https://github.com/mattcurrie/mealybug-tearoom-tests)
+- [CasualPokePlayer's tests](https://github.com/CasualPokePlayer/test-roms)
+
+## Tested emulators
+
+- [ares](https://ares-emu.net/)
+- [Beaten Dying Moon](https://mattcurrie.com/bdm-demo/)
+- [BGB](https://bgb.bircd.org/)
+- [binjgb](https://github.com/binji/binjgb)
+- [DocBoy](https://github.com/Docheinstein/docboy)
+- [Emmy](https://emmy.n1ark.com/)
+- [Emulicious](https://emulicious.net/)
+- [Gambatte-Speedrun](https://github.com/pokemon-speedrunning/gambatte-speedrun)
+- [GameRoy](https://github.com/Rodrigodd/gameroy)
+- [Goomba Color](https://www.dwedit.org/gba/goombacolor.php)
+- [KiGB](http://kigb.emuunlim.com/)
+- [mGBA](https://mgba.io/)
+- [NO$GMB](https://problemkaputt.de/gmb.htm)
+- [PyBoy](https://github.com/Baekalfen/PyBoy)
+- [SameBoy](https://sameboy.github.io/)
+- [VisualBoyAdvance](https://sourceforge.net/projects/vba/)
+- [VisualBoyAdvance-M](https://github.com/visualboyadvance-m/visualboyadvance-m)
+
+## System requirements
+
+- Windows (for running most emulators)
+- Python 3.7+
+
+## Usage
+
+Install the dependencies:
+
+```sh
+python -m pip install -r requirements-core.txt
+python -m pip install -r requirements.txt
+```
+
+Run all tests on all emulators:
+
+```sh
+python main.py
+```
+
+Run only specific tests:
+
+```sh
+python main.py --test blargg --test mooneye
+```
+
+Run only on specific emulators:
+
+```sh
+python main.py --emulator mgba --emulator sameboy
+```
+
+Run only tests for specific Game Boy models:
+
+```sh
+python main.py --model DMG    # Original Game Boy
+python main.py --model SGB    # Super Game Boy
+python main.py --model CGB    # Game Boy Color
+```
+
+Generate emulator and test metadata JSON files:
+
+```sh
+python main.py --dump-emulators-json --dump-tests-json
+```
+
+Build the HTML report:
+
+```sh
+python build.py --emulators emulators.json --tests tests.json --results-dir . --output index.html
+```
+
+## License
+
+GBEmulatorShootout is released under the [MIT license](LICENSE).