Add StyleCI badge

Author: carloscarucce

README.md

@@ -1,3 +1,4 @@
-# schema-validator-php
+# Schema Validator
 
-[![codecov](https://codecov.io/gh/WebdevCave/schema-validator-php/graph/badge.svg?token=lC2scjv7Co)](https://codecov.io/gh/WebdevCave/schema-validator-php)
+[![codecov](https://codecov.io/gh/WebdevCave/schema-validator-php/graph/badge.svg?token=lC2scjv7Co)](https://codecov.io/gh/WebdevCave/schema-validator-php)
+![StyleCI](https://github.styleci.io/repos/911763600/shield?branch=main)