Merge pull request #64 from dr40/dev

Create domain category
Merge pull request #67 from dr40/dev

Notification and User
IVVQ-Group5-Musements-24 Create Domain For Category
Merge pull request #71 from dr40/dev

Merge Notification and Post
Merge pull request #72 from dr40/ok/24/Create_Domain_For_Category

Ok/24/create domain for category