Problem/Motivation
In #3192842: Make our README more welcoming by converting it into an "entrypoint" into the Drupal ecosystem we converted the base README file from README.txt to README.md. We should consider converting all other READMEs in the codebase as well.
---- original report ------
If we have a look at the following link
https://git.drupalcode.org/project/drupal
We will notice the nice gitlab interface :)
But we could make the project code even more readable with the .md files
something like https://git.drupalcode.org/project/anchor_link for example
README.md will be nice, but not sure if we should do the change for all .txt files, but not the robots.txt or alike functional files
Proposed resolution
Convert all README.txt files in core to README.md.
Change all references to these files from README.txt to README.md.