You can of course just clone the repo to where you need it. The easiest way to install it globally on your computer is through luarocks:
sudo luarocks install --server=https://luarocks.org/dev wauRead up on the documentation in docs/ especially if you come from C libwayland programming.
I also think the examples are great to get a grasp of wau. To run the examples, you need to run make in the example directory. I advise you to check out list_globals.lua and foreign_toplevel_manager.lua. If you are using lua 5.3 and you got lua lgi installed, you can also try running the other two examples. They require the built of helpers.so to be successful though. They are also inherintly more complex as they handle some graphics to show in the windows they create.
wau wau ~ 🐕