This is suckless software, the source code is the documentation! Check out their website.
This build of dwm does not block color emoji in the status/info bar, so you must install libxft-bgra from the AUR, which fixes a libxft color emoji rendering problem, otherwise dwm will crash upon trying to render one. Hopefully this fix will be in all libxft soon enough.
If libxft-bgra won't work, you can try uninstalling all suckless software and after that installing the libxft pactch. If this also won't work you can try libxft-bgra-git (also form the AUR) instead.