Add codacy badge to readme (#468)

Co-authored-by: someone <someone@example.com>

.github/workflows/docs.yml

@@ -1,4 +1,4 @@
-name: Build Docs
+name: Docs
 
 on:
   push:

.github/workflows/nightly.yml

@@ -1,4 +1,4 @@
-name: Nightly-regression Test
+name: Nightly-Regression Tests
 
 on:
   workflow_dispatch: # run on request (no need for PR)

.github/workflows/pre_merge.yml

@@ -1,4 +1,4 @@
-name: Pre-merge Checks
+name: Pre-Merge Checks
 
 on:
   push:

README.md

@@ -14,10 +14,11 @@
 [![python](https://img.shields.io/badge/python-3.7%2B-green)]()
 [![pytorch](https://img.shields.io/badge/pytorch-1.8.1%2B-orange)]()
 [![openvino](https://img.shields.io/badge/openvino-2021.4.2-purple)]()
+[![Codacy Badge](https://app.codacy.com/project/badge/Grade/684927c1c76c4c5e94bb53480812fbbb)](https://www.codacy.com/gh/openvinotoolkit/anomalib/dashboard?utm_source=github.com&utm_medium=referral&utm_content=openvinotoolkit/anomalib&utm_campaign=Badge_Grade)
 [![black](https://img.shields.io/badge/code%20style-black-000000.svg)]()
-[![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)
+[![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)
+[![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>