Ek comments

* Add accept match request button to match request show page
* Add controller action to accept match request
* Match Request show page shows "confirmed" if confirmed and am "accept" button if not confirmed
A match request is different from a match because a match request allows one user to request a match with another user. The user requesting the match can provide a date range for the opponent. The 2 users can comment on the match request show page and try to find a date and time that works for both of them. 

On the other hand, once the match request is confirmed, a match will be created. A match has the 2 players, date, location, winner, and also the score of the match.