Coverage badge added

Author: olyapka84

README.md

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 [![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=olyapka84_python-project-52&metric=alert_status)](https://sonarcloud.io/summary/new_code?id=olyapka84_python-project-52)
 
+[![Coverage](https://sonarcloud.io/api/project_badges/measure?project=olyapka84_python-project-52&metric=coverage)](https://sonarcloud.io/summary/new_code?id=olyapka84_python-project-52)
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 ## Task Manager
 
 Task Manager is a web application built with Django that allows users to register, log in, and manage tasks with statuses and labels.