➕ Add PyPI downloads badge to the readme. (#370)

* ➕Added PyPI downloads badge to the readme.

* Convert orange color to grey

* Changed colors to grey and green

* Do not center the text.

README.md

@@ -17,7 +17,7 @@ ___
 [![Nightly-regression Test](https://github.com/openvinotoolkit/anomalib/actions/workflows/nightly.yml/badge.svg)](https://github.com/openvinotoolkit/anomalib/actions/workflows/nightly.yml)
 [![Pre-merge Checks](https://github.com/openvinotoolkit/anomalib/actions/workflows/pre_merge.yml/badge.svg)](https://github.com/openvinotoolkit/anomalib/actions/workflows/pre_merge.yml)
 [![Build Docs](https://github.com/openvinotoolkit/anomalib/actions/workflows/docs.yml/badge.svg)](https://github.com/openvinotoolkit/anomalib/actions/workflows/docs.yml)
-
+[![Downloads](https://static.pepy.tech/personalized-badge/anomalib?period=total&units=international_system&left_color=grey&right_color=green&left_text=PyPI%20Downloads)](https://pepy.tech/project/anomalib)
 </div>
 
 ___