The project is fully open source, so feel free to folk it and add your custom touches. However, please include the reference to this project as the source, or at least, the "inspiration".
As noted in the README.md, this is simply an Electron wrapper for the Facebook website with my additional touches to make it easier to use while retaining most of browser features, such as editable options. So, it's very obvious that you have Node.js installed, and have basic Electron knowledge. Electron Builder is used to build the project.
To pack the project, run npm run pack to build binary files for your current OS with default configurations in package.json file. Or you can run npm run pack-mac, npm run pack-linux on Linux, or npm run pack-win to build binary files for other OS'es.
You'll need to notarize macOS package. See notarize.js for more details.