Feature Request - Deck Comments

I don't know if this has been suggested or not, but I'd love to see the option to be able to put comments on your decks. I've used something similar to this on Cockatrice to save the URL of the website where I have my deck saved at so I don't have to keep them either bookmarked or saved somewhere else. It'd also be good to have if you shared your .dck file to a friend and they'd be able to see any comments you wrote about your deck to help them understand how your deck plays.

No files, tests, or entry points are mentioned. First clarify where deck comments should be edited and displayed, how they should be stored in or alongside .dck files, and what sharing behavior is required; done means an agreed scope and acceptance criteria for the feature.

Written by the indexing model from the issue text.