Add `gitcommit` and `gitrebase` language?

Language name

• Git Commit
• Git Rebase

URL of example repository

I think this is N/A, since a normal repository wouldn't commit any files that are in the .git directory.

URL of syntax highlighting grammar

• https://github.com/textmate/git.tmbundle/blob/master/Syntaxes/Git%20Commit%20Message.tmLanguage
• https://github.com/textmate/git.tmbundle/blob/master/Syntaxes/Git%20Rebase%20Message.tmLanguage

Most popular extensions

Likely N/A, but the filenames are

• COMMIT_EDITMSG
• git-rebase-todo

Detected language

None/Plain text

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While the files themselves are unlikely to be present in a repository (there are a lot of results for COMMIT_EDITMSG, though), GitHub also uses linguist to highlight code blocks in Markdown, per my understanding.

Considering that these are common git use cases, I believe that the option to highlight their syntax in Markdown should be available. I think that GitHub should support syntax highlighting for git filetypes :laughing:

If it is reasonable to support syntax highlighting for these types of files, could you please consider it?