Create valid-country.md

Author: milwad-dev

docs/1.x/valid-country.md

@@ -0,0 +1,34 @@
+## ValidCountry
+
+If you want to validate the country name, you can use the `ValidCountry` rule:
+
+```php
+use Milwad\LaravelValidate\Rules\ValidCountry;
+
+return [
+    'country' => ['required', new ValidCountry()], // country => United Arab Emirates
+];
+```
+
+Also, you can validate country name by key like "AE":
+
+```php
+use Milwad\LaravelValidate\Rules\ValidCountry;
+
+return [
+    'country' => ['required', new ValidCountry(validByKey: true)], // country => "AE"
+];
+```
+
+For see the list of country name, you can open `config/laravel-validate.php`, and go to `countries` key:
+
+```php
+/*
+ * The list of country names.
+ *
+ * If any country name is missing from this list, you can add your country name to this array.
+ */
+'countries' => [...],
+```
+
+> If any country name is missing from this list, you can add your country name to this array.