feat: Add Discord badge in README.md (TheAlgorithms#4357)

* feat: Add Discord badge in `README.md`

* Update README.md

Co-authored-by: Dhruv Manilawala <[email protected]>

Author: Panquesito7

Diff for: README.md

@@ -1,5 +1,6 @@
 # The Algorithms - Python
 [![Gitpod Ready-to-Code](https://img.shields.io/badge/Gitpod-Ready--to--Code-blue?logo=gitpod&style=flat-square)](https://gitpod.io/#https://github.com/TheAlgorithms/Python) 
+[![Discord chat](https://img.shields.io/discord/808045925556682782.svg?logo=discord&colorB=7289DA&style=flat-square)](https://discord.gg/c7MnfGFGa6) 
 [![Gitter chat](https://img.shields.io/badge/Chat-Gitter-ff69b4.svg?label=Chat&logo=gitter&style=flat-square)](https://gitter.im/TheAlgorithms) 
 [![GitHub Workflow Status](https://img.shields.io/github/workflow/status/TheAlgorithms/Python/build?label=CI&logo=github&style=flat-square)](https://github.com/TheAlgorithms/Python/actions) 
 [![LGTM](https://img.shields.io/lgtm/alerts/github/TheAlgorithms/Python.svg?label=LGTM&logo=LGTM&style=flat-square)](https://lgtm.com/projects/g/TheAlgorithms/Python/alerts)