Add Pivot table for the relationship between Cities and Companies.

app/Models/Company.php

@@ -5,6 +5,7 @@ namespace App\Models;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
 
 class Company extends Model
 {
@@ -17,6 +18,11 @@ class Company extends Model
         'description',
     ];
 
+    public function cities(): BelongsToMany
+    {
+        return $this->belongsToMany(City::class, 'cities_companies', 'company_id', 'city_id');
+    }
+
     public function categories(): HasMany
     {
         return $this->hasMany(Category::class);