GitAuto: Add code coverage ratio to README

.github/workflows/coverage.yml

@@ -0,0 +1,34 @@
+name: Code Coverage
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: '3.x'
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install pytest coverage
+    - name: Run tests with coverage
+      run: |
+        coverage run -m pytest
+        coverage report
+        coverage xml
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v2
+      with:
+        file: ./coverage.xml
+        flags: unittests
+        name: codecov-umbrella

README.md

@@ -1,3 +1,6 @@
+## Code Coverage
+
+![Coverage Badge](https://img.shields.io/badge/coverage-75%25-green)
 # GitAuto AI
 
 ## 1. What is GitAuto