Add a readme

README.md

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+## BouncyWM
+
+### What is this?
+
+My solution to [https://jvns.ca/blog/2019/11/25/challenge--make-a-bouncy-window-manager/](https://jvns.ca/blog/2019/11/25/challenge--make-a-bouncy-window-manager/) in Nim.
+
+### How to build it?
+Install nim and nimble and run `nimble build`. You must have XLib development headers on your system (and obviously an X server).
+
+### How to run it?
+```
+Xephyr -ac -screen 1280x1024 -br -reset -terminate 2> /dev/null :1 &
+env DISPLAY=:1 ./nimwin
+```
+
+### How to launch a window?
+If you want to run xterm, for example, just run `xterm -display :1`