Can now store and validate auto budget

app/Models/Budget.php

@@ -23,6 +23,7 @@ declare(strict_types=1);
 namespace FireflyIII\Models;
 
 use Carbon\Carbon;
+use FireflyIII\AutoBudget;
 use FireflyIII\User;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
@@ -122,6 +123,16 @@ class Budget extends Model
         return $this->hasMany(BudgetLimit::class);
     }
 
+
+    /**
+     * @codeCoverageIgnore
+     * @return HasMany
+     */
+    public function autoBudgets(): HasMany
+    {
+        return $this->hasMany(AutoBudget::class);
+    }
+
     /**
      * @codeCoverageIgnore
      * @return BelongsToMany