Add README and LICENSE

README.md

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+# xbanan
+
+An X11 compatibility layer for [banan-os's](https://git.bananymous.com/Bananymous/banan-os) native GUI windowing system.
+
+## Running on linux
+
+### Building
+```sh
+git clone --recursive https://git.bananymous.com/Bananymous/xbanan.git
+cd xbanan
+
+cd banan-os
+git apply ../0001-linux-window-server-sdl2.patch
+cd ..
+
+cmake -B build -S . -G Ninja
+cmake --build build
+```
+
+### Running
+
+To start the WindowServer, run the following command in project root
+```sh
+./build/banan-os/userspace/programs/WindowServer/WindowServer
+```
+To run X11 apps specify `DISPLAY=:69` environment variable. For example
+```sh
+DISPLAY=:69 xeyes
+```