Hi!
I thinkCOBOL is always relevant and will become more relevant in the future in terms of jobs in the field.

Therefore, I think it would make sense to offer COBOL as a shield as well - there are also COBOL developers within the GitHub community :-) I wouldn't count myself among them, but I know the basics of COBOL.

I think you could use “COB” or “CBL” - both are valid file name extensions for COBOL files.

I would really like to see COBOL included! :-)