The Moonlight Framework is a Roblox Framework/Library made in Luau the programming language of Roblox providing developers with helpful functions and tools.
To install Moonlight Framework, all you need to do is require it. Paste the following line into the top of your script.
local moon = require(8288681721)
Do NOT use the ModuleScript code from the repo and use it. It is for development only, and not a full release.
Using require() always makes sure you are using the latest version, which is v0.1.1
Only you the developer needs to put this in your script, and whoever you are giving your service too doesn't need to install Moonlight. For development, you can just copy the source code from the repo, and make push requests to add new functions.
I believe the documentation is very good, so please check the documentation here.