I am trying to figure out how to add a GitHub project to my simple, working Launchpad PPA package. The GitHub project that I am try to add is https://github.com/compiz-reloaded/compiz-boxmenu. I couldn't find much help online and I'm hoping that someone can help point me in the right direction on how to accomplish this. Thanks!
You need to 'debianize' your package first. The debianization depends on the package type, and the manual for a package debianization is called Debian Policy.
This wiki is also very useful. Once you have your package debianized, you should compile it using the source option (I usually do it using dpkg-buildpackage -S. Pass your key using -k<Key> also. The same one you uploaded to your launchpad account.
Once you built your source, you will find a file called package_version.changes. You basically upload it as described in your PPA information. The package will be compiled, and, if no errors are found, it will be available in the PPA. If you want to enable the build for other architectures, as IBM POWER (ppc64el) or ARM (aarch64) , you should opt in.