(11.1.a) As A USER I want to FOLLOW AND UNFOLLOW any other user

[tomat-suppe]

Pre-requsites:

• Working log-in functionality

Acceptance criteria:

• Users can follow any user except themselves
• Users can unfollow any user they've already followed
• Users do not initially follow ANYONE
• Any username should have the 'follow' or 'unfollow' link next to it, on any cheeps (personal choice: maybe not on the user that is logged in?)
• Clicking a follow or unfollow link needs to log in our program, that this user is now following or unfollowed this other user
• Clicking follow or unfollow can just redirect user to the the current page (only difference is internally in the program, and the button that pressed changing between follow and unfollow)
• Refactor your repositories, DTOs, views, etc. accordingly.