I downloaded the files from "github.com"

I need a text editor with a standard set of functions.
I downloaded all the files.
I can not figure out this pile of files.
How to install netrix?
Could you tell me where to start.
Could you tell me how to install a minimal text editor?
Or where can I read the documentation?
I need to connect the library I have selected through the menu "Add an existing element"?
But it does not work for me either.
Or am I doing something wrong.
