Create document comment/reply

As a user with read access to a document
I want to be able to create a comment/reply on that document
So that I can express my point of view on the document

Functional description

A user can create a comment on a document or a reply on a comment

Comments have an input at the bottom (end of all comments) :

• placeholder should be "Write a comment here"
• once submitted, it should create a new comment at the bottom.

Reply action is presented on every comment.

• clicking will present and focus on an input. It loads also the first batch of replies.
• once submitted, it should create a new comment at the bottom of the replies.

Acceptance criteria

1. I create a new comment, it is presented with comment format right after. if I refresh the document I should see the comment
2. I create a new reply, it is presented with reply format at the end of replies. If I refresh the document and expand the replies from the correct comment, my reply should be there
3. I should be able to create several comments in series without refresh the app
4. I should be able to create several replies in series without refresh the app
5. I should be able to create several replies in series on different comments without refresh the app
6. Comments and replies created present the correct "time ago" text