add the comment table for each event

[S-Toky]

for each event, the possibility to post comments helps users to interact with the event itself.

[Israel-Laguan]

This would require backend (tables and associations, controllers, models, routes). Please add a backend ticket so the frontend for comments can be added

[S-Toky]

I have finished the code for the commentary and the commentary response.
working hour 6h