Add the #license section to the README.md (props to @azaozz).

test/php/gutenberg-coding-standards/README.md

@@ -1,3 +1,9 @@
 # Gutenberg Coding Standards for Gutenberg
 
-This project is a collection of [PHP_CodeSniffer](https://github.com/squizlabs/PHP_CodeSniffer) rules (sniffs) to validate code developed for Gutenberg. It ensures code quality and adherence to coding conventions.
+This project is a collection of [PHP_CodeSniffer](https://github.com/PHPCSStandards/PHP_CodeSniffer) rules (sniffs) to validate code developed for Gutenberg. It ensures code quality and adherence to coding conventions.
+
+## License
+
+This project is licensed under the same terms as the Gutenberg project.
+
+Please refer to this [LICENSE.md](../../../LICENSE.md) file for detailed license information.