Add workflow badge to readme

Author: enescakir

README.md

@@ -1,4 +1,5 @@
-# Ubicloud Documentation
+# Ubicloud Documentation [![Prettier](https://github.com/ubicloud/documentation/actions/workflows/prettier.yml/badge.svg)](https://github.com/ubicloud/documentation/actions/workflows/prettier.yml)
+
 
 The documentation for Ubicloud (https://www.ubicloud.com/docs) is based on mdx and hosted by Mintlify.