Add badges for code style and pre-commit in README.md (#2516)

* Add badges for code style and pre-commit

* Update badge style to flat-square

* Update Gitpod logo style to flat-square

Author: dhruvmanila

Diff for: README.md

@@ -1,11 +1,13 @@
 # The Algorithms - Python
-[![Gitpod Ready-to-Code](https://img.shields.io/badge/Gitpod-Ready--to--Code-blue?logo=gitpod)](https://gitpod.io/#https://github.com/TheAlgorithms/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)
 [![Gitter chat](https://img.shields.io/badge/Chat-Gitter-ff69b4.svg?label=Chat&logo=gitter&style=flat-square)](https://gitter.im/TheAlgorithms) 
 [![Build Status](https://img.shields.io/travis/TheAlgorithms/Python.svg?label=Travis%20CI&logo=travis&style=flat-square)](https://travis-ci.com/TheAlgorithms/Python) 
 [![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) 
 [![contributions welcome](https://img.shields.io/static/v1.svg?label=Contributions&message=Welcome&color=0059b3&style=flat-square)](https://github.com/TheAlgorithms/Python/blob/master/CONTRIBUTING.md) 
 [![Donate](https://img.shields.io/badge/Donate-PayPal-green.svg?logo=paypal&style=flat-square)](https://www.paypal.me/TheAlgorithms/100) 
 ![](https://img.shields.io/github/repo-size/TheAlgorithms/Python.svg?label=Repo%20size&style=flat-square) 
+[![pre-commit](https://img.shields.io/badge/pre--commit-enabled-brightgreen?logo=pre-commit&logoColor=white&style=flat-square)](https://github.com/pre-commit/pre-commit)
+[![code style: black](https://img.shields.io/static/v1?label=code%20style&message=black&color=black&style=flat-square)](https://github.com/psf/black)
 <!--[![Tested on Python 3.7](https://img.shields.io/badge/Tested%20-Python%203.7-blue.svg?logo=python&style=flat-square)]( https://www.python.org/downloads) &nbsp;-->
 
 ### All algorithms implemented in Python (for education)