Add project

[czytelny]

Administrator should be able to add new project.

fields

• name
• shortcut name (used in URL, 3-4 letters)
• description
• project leader (user)
• assigned users (to consider: easy assigning multiple users)

Assumptions:

• one project may have many users
• one user can be assigned either to 0 or to many projects
• one project may have many items
• one item can be assigned to one project