chore: update readme with sonarcloud badges and usage section

Author: andrea-acampora

README.md

@@ -4,7 +4,23 @@
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg?style=plastic)](https://opensource.org/licenses/MIT)
 ![Version](https://img.shields.io/github/v/release/smartoperatingblock/user-management-integration-microservice?style=plastic)
 
+[![Code Smells](https://sonarcloud.io/api/project_badges/measure?project=SmartOperatingBlock_user-management-integration-microservice&metric=code_smells)](https://sonarcloud.io/summary/new_code?id=SmartOperatingBlock_user-management-integration-microservice)
+[![Bugs](https://sonarcloud.io/api/project_badges/measure?project=SmartOperatingBlock_user-management-integration-microservice&metric=bugs)](https://sonarcloud.io/summary/new_code?id=SmartOperatingBlock_user-management-integration-microservice)
+[![Vulnerabilities](https://sonarcloud.io/api/project_badges/measure?project=SmartOperatingBlock_user-management-integration-microservice&metric=vulnerabilities)](https://sonarcloud.io/summary/new_code?id=SmartOperatingBlock_user-management-integration-microservice)
+[![Duplicated Lines (%)](https://sonarcloud.io/api/project_badges/measure?project=SmartOperatingBlock_user-management-integration-microservice&metric=duplicated_lines_density)](https://sonarcloud.io/summary/new_code?id=SmartOperatingBlock_user-management-integration-microservice)
+
 An integration microservice responsible to manage Operating Block users:
 - User Authentication
 - Health Professionals Digital Twins creation
 - Health Professionals information system
+
+## Usage 
+1. Provide a `.env` file with the following variables:
+    - USER_MANAGEMENT_MONGODB_URL
+2. Run the container with the command:
+   
+   `docker run ghcr.io/smartoperatingblock/user-management-integration-microservice:latest`
+
+## Documentation
+- Check out the *Rest API* [here](https://smartoperatingblock.github.io/user-management-integration-microservice/documentation/openapi-doc)
+- Check out the *Code documentation* [here](https://smartoperatingblock.github.io/user-management-integration-microservice/documentation/code-doc)