Add documentation for Iran car license plate

Author: vahidkaargar

docs/1.x/valid-iran-plate.md

@@ -0,0 +1,15 @@
+## ValidIranPlate
+
+If you want to validate the Iran license plate number, you can use the `ValidIranPlate` rule:
+
+```php
+use Milwad\LaravelValidate\Rules\ValidIranPlate;
+
+return [
+    'car-plate-number' => ['required', new ValidCarNumber()], 
+    /*
+     * Iran plate license number:
+     * 32 ی 321 ایران 45
+     */
+];
+```