The project language file for this project is Markdown, as this project (Seanpm2001/Nuclear-Ad-Bombs-Specification) focuses directly on content written in Markdown.
This is an instance in which I am using Markdown as a project language file, as I learned how to make the GitHub linguist recognize Markdown as a language. I found this out when snooping around on Apple/Swift Evolution if you want to do this yourself, simply add this to your .gitattributes file (if you haven't created one yet, make it now, do not add anything else to the file name but .gitattributes)
*.md linguist-detectable=true
*.md linguist-documentation=falseAdvanced version:
# Markdown (*.md, *.mkd, *.mdown, *.markdown)
*.md linguist-detectable=true
*.md linguist-documentation=false
*.mkd linguist-detectable=true
*.mkd linguist-documentation=false
*.mdown linguist-detectable=true
*.mdown linguist-documentation=false
*.markdown linguist-detectable=true
*.markdown linguist-documentation=falseFile type: Markdown document (*.md, *.mkd, *.mdown, *.markdown)
File version: 1 (Thursday, 2022 March 17th at 4:57 pm)
Line count (including blank lines and compiler line): 40