Earn functionality: Add a Comment (shortcuts 'A' AND/OR 'M')

[Fernando A_ Garcia]

Trying to be brief (appeal 😊):

I prefer to use the keyboard and I miss a shortcut to add comments to cards (I think I'm not alone in this 😬);

I noticed that the 'A' and 'M' keys are associated with the "Members" function. Suggestion:

- Could set 'A' key to add a comment (like "[A]ctivity" or "[A]dd")

Thank U, Trello!