Update index.md

Author: eadwinCode

docs/index.md

@@ -5,6 +5,7 @@
 <p align="center"> Ellar - Python ASGI web framework for building fast, efficient and scalable RESTAPIs and server-side application. </p>
 
 ![Test](https://github.com/eadwinCode/ellar/actions/workflows/test_full.yml/badge.svg)
+![Coverage](https://img.shields.io/codecov/c/github/eadwinCode/ellar)
 [![PyPI version](https://badge.fury.io/py/ellar.svg)](https://badge.fury.io/py/ellar)
 [![PyPI version](https://img.shields.io/pypi/v/ellar.svg)](https://pypi.python.org/pypi/ellar)
 [![PyPI version](https://img.shields.io/pypi/pyversions/ellar.svg)](https://pypi.python.org/pypi/ellar)