US14 Modal for duplicate avoidance

Value Proposition

As a user I want to be notified if a player/season combination is already saved in my list So that I can avoid duplicates

Scribble US14

[x] After searching for a player/season combination, that is already saved in the player list, a modal and an overlay open
[x] The user gets the message "This player/season combination is already saved."
[x] Two buttons New Search and View Player are visible
[x] Hitting New Search closes the modal and overlay so that the user can search again
[x] Hitting View Player closes the modal and overlay and redirects the user to the details view for the searched player

[x] Create a feature branch feature/duplicate-avoidance
[x] Add a modal and an overlay and style them
[x] Implement the logic to compare the searched player/season combination with the database entries and trigger the modal and overlay if there is a match
[x] Create two buttons New Search and View Player for the overlay and Implement the logic for them