updated readme

README.md

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 ## Introduction
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 [![codecov](https://codecov.io/gh/aymanehachcham/mentor-mingle/branch/main/graph/badge.svg)](https://codecov.io/gh/aymanehachcham/mentor-mingle)
+![Tests](https://github.com/aymanehachcham/mentor-mingle/actions/workflows/ci.yml/badge.svg)
 
 Mentor Mingle is an AI agent that helps you prepare for your next interview. It is a chatbot that can answer your questions about a company, a job role, or a specific interview question. It can also help you practice your interview skills by conducting a mock interview with you. 
 It can also help you prepare for your interview by giving you a list of questions that you can practice answering.