added support for adding/removing movies from a movie list

app/Policies/MovieListPolicy.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace App\Policies;
+
+use App\Models\MovieList;
+use App\Models\User;
+
+class MovieListPolicy
+{
+    /**
+     * Create a new policy instance.
+     */
+    public function __construct()
+    {
+        //
+    }
+
+    public function create(User $user): bool
+    {
+        return true;
+    }
+
+    public function view(User $user, MovieList $movieList): bool
+    {
+        if ($movieList->owner === $user->getKey() || $movieList->isPublic) {
+            return true;
+        }
+
+        return false;
+    }
+
+    public function update(User $user, MovieList $movieList): bool
+    {
+        if ($movieList->owner === $user->getKey()) {
+            return true;
+        }
+
+        return false;
+    }
+
+    public function delete(User $user, MovieList $movieList): bool
+    {
+        if ($movieList->owner === $user->getKey()) {
+            return true;
+        }
+
+        return false;
+    }
+}