docs: add usecase diagram

@startuml

left to right direction

skinparam rectangle {

    BackgroundColor LightBlue

}

actor "User" as u

actor "Registered user" as ru

actor "Admin" as ad

rectangle "Movies Recommender Catalogue"{

  usecase "Register" as register

  usecase "Rate movie" as rm

  usecase "Browse movie catalogue" as bmc

  usecase "Login" as login

  usecase "Search movie" as search

  usecase "Delete movie" as delete

  usecase "Update movie" as update

  usecase "Add movie" as add

  usecase "View movie details" as vmd

  usecase "Get recommended movies" as grm

  usecase "Filter by category" as fbc

}

ad -> delete

ad --> update

ad --> add

ru --> search

ru --> grm

ru --> rm

ru --> vmd

ru --> bmc

(search) <. (fbc) : extends

(rm) .> (vmd) : include

(grm) .> (vmd) : include

u --> login

u --> register

@enduml

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