Here is a basic "readme" file.
This file can be edited, can include stuff, and can be formatted like this.
Thsi kind of file is best thought of as a place for notes.
You can use it to write out summaries of what you're working on that aren't embedded in code.
This is called Markdown and is a a plaintext way of formatting supported by most programming-adjacent tools (like VS Code, RStudio, GitHub, etc.). You format things by including special characters. You can find out more here (https://www.markdownguide.org/cheat-sheet/).
Note that I can more nicely format that link like this.
That's all folks!
That was a looney toons reference.