If you are using this library for the first time. You have to do following.
Copy the contents of .mastervimrc into your top level .vimrc and then make sure you change the paths of the rest of the files mentioned to point to files in this repo
I use vim plug as the plugin manager. You would need to follow the instructions here to install this for your platform
https://github.com/junegunn/vim-plug
Now when you open vim or neovim
Run following
:PlugInstall