flit - a vcs inspired by git

After way too many back and forths (should we implement the flit add command like that, nevermind it's too complex). I finally implemented the flit add command! It works pretty much like the git add command, it adds the file to staging!)

Thought about the design of flit, I decided to make it similar to git (since the original idea was to make a git copycat) but still different, for example I'll try to hold most files inside of .flit as normal text so any user can read it.

Also worked on the first command of flit, which will be init (like git init)