Added README.md and udev rule

50-sebaweb-keyboard.rules

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+# Rule to give userspace access to the test keyboard
+SUBSYSTEMS=="usb", ATTRS{idVendor}=="cafe", ATTRS{idProduct}=="53ba", TAG+="uaccess"

README.md

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+# Custom keyboard control software
+This is a piece of software to control the RGB on sebaweb developed rp2040 based keyboards.  
+
+## Compiling
+Linux is currently the only supported platform, if you wish to help with porting the software to other platforms you are free to do so.
+To compile the program use `cargo`  
+```
+cargo build --release
+```
+
+## Installing on linux
+Linux is currently the only supported platform, if you wish to help with porting the software to other platforms you are free to do so.
+To install the software copy the compiled binary into `/usr/bin/` and the udev rule into `/etc/udev/rules.d/`  
+TODO: Make makefile or install script  
+```
+cargo build --release && sudo cp ./target/release/keyboard_control_software /usr/bin/.  
+sudo cp ./50-sebaweb-keyboard.rules /etc/udev/rules.d/.
+```
+NOTE: Do not run the program with sudo rights, for some reason it crashes ¯\\_(ツ)_/¯  
+
+## Future plans (In no specific order)
+- Support other OSes  
+- Find a better way to select keys that allow for selecting multiple keys at once  
+- Make keys the colour they currently are on the hardware  
+- Add function to request the current colours from the device at startup so the colours are synchronized