docs: update readme with codeclimate badge

README.md

@@ -1,7 +1,13 @@
-# Aam Digital Backend Services
+# Aam Digital Services
+
+Collection of aam-digital services and tools
+
+### aam-backend-service
+
+[![Maintainability](https://api.codeclimate.com/v1/badges/57213b5887a579196d6d/maintainability)](https://codeclimate.com/github/Aam-Digital/aam-services/maintainability)
 
 A modularize Spring Boot application that contains API modules for [Aam Digital's case management platform](https://github.com/Aam-Digital/ndb-core).
 
-## API Modules
+#### API Modules
 
 - **Reporting**: Calculate aggregated reports and run queries on all data, accessible for external services for API integrations of systems