The readme file is broken. At least it was for me.
It was called README.rd
I changed the file to .txt in order to read it
The file isn't broken, this is a Markdown file (.md, not .rd). Markdown is a markup language, like HTML, so it means that using special annotations to the text some readers (like GitHub) can interpret those annotations and format the text.
The advantage of Markdown is that you can read the file even if the file is not interpreted. Going to the repository in GitHub you can see how the file should be shown by a Markdown-aware header: https://github.com/m45t3r/HBL-Emergency