Update README.md

README.md

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-# TETRIS-OS
+# TETRIS-OS: An operating system that only plays Tetris.
+
+![screenshot](images/0.png)
+
+#### Features:
+- It's Tetris.
+- 32-bit (x86)
+- Fully custom bootloader
+- Soundblaster 16 driver
+- Custom music track runner
+- Fully hardcoded tetris theme
+- Double-buffered 60 FPS graphics at 320x200 pixels with custom 8-bit RGB palette
+
+#### Running
+**NOTE**: This has *only* been tested in an emulator. Real hardware might not like it.
+
+##### Mac OS
+```
+$ make iso
+$ qemu-system-i386 -drive format=raw,file=boot.iso -d cpu_reset -monitor stdio -device sb16 -audiodev coreaudio,id=coreaudio,out.frequency=48000,out.channels=2,out.format=s32
+```
+
+##### Unix-like
+Use the same command as Mac OS, but try with `pulseaudio` as the audio device.
+
+##### Windows
+Absolutely no idea.
+
+##### Real hardware
+You probably know what you're doing if you're going to try this. Just burn `boot.iso` onto some bootable media and give it a go. If things break, try disabling all of the music since you *probably* don't have something with a SB16 in it.