[4pt]-FE- "Reserve" form

[keroloussamy]

Add a "Reserve" form page that adds a new reservation on the front-end app.

To reserve an appointment, the user has to select a date and city (username and selected item are autofilled).
Use the design based on the "Book a vespa test-ride" and add all necessary inputs.
The user can also access the "Reserve" page from the navigation panel. In that case only username is autofilled.