Added test coverage report + code coverage tracking + README badge

.coveragerc

@@ -0,0 +1,2 @@
+[report]
+show_missing = True

.github/workflows/ci.yml

@@ -30,6 +30,13 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade hatch
-      - name: Run tests for Python ${{ matrix.python-version }} and Django ${{ matrix.django-version }} on ${{ matrix.os }}
+      - name: Run tests for Python ${{ matrix.python-version }} and Django ${{ matrix.django-version }} on ${{ matrix.os }} with coverage
         run: |
-          hatch run test.py${{ matrix.python-version }}-${{ matrix.django-version }}:test
+          hatch run test.py${{ matrix.python-version }}-${{ matrix.django-version }}:test-cov
+      - name: Run coverage report for Python ${{ matrix.python-version }} and Django ${{ matrix.django-version }} on ${{ matrix.os }}
+        run: |
+          hatch run test.py${{ matrix.python-version }}-${{ matrix.django-version }}:coverage report
+      - name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v3
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}

README.md

@@ -1,7 +1,7 @@
 django-generic-links
 ====================
 
-![Python Compatibility](https://img.shields.io/badge/python-3.9%20%7C%203.10%20%7C%203.11%20%7C%203.12-blue.svg) [![PyPi Version](https://img.shields.io/pypi/v/django-generic-links.svg)](https://pypi.python.org/pypi/django-generic-links)  ![CI badge](https://github.com/matagus/django-generic-links/actions/workflows/ci.yml/badge.svg) [![License](https://img.shields.io/badge/License-BSD_3--Clause-blue.svg)](https://opensource.org/licenses/BSD-3-Clause)
+![Python Compatibility](https://img.shields.io/badge/python-3.9%20%7C%203.10%20%7C%203.11%20%7C%203.12-blue.svg) [![PyPi Version](https://img.shields.io/pypi/v/django-generic-links.svg)](https://pypi.python.org/pypi/django-generic-links)  ![CI badge](https://github.com/matagus/django-generic-links/actions/workflows/ci.yml/badge.svg) [![codecov](https://codecov.io/gh/matagus/django-generic-links/graph/badge.svg?token=a64SxEDQk0)](https://codecov.io/gh/matagus/django-generic-links) [![License](https://img.shields.io/badge/License-BSD_3--Clause-blue.svg)](https://opensource.org/licenses/BSD-3-Clause)
 
 Simple app to attach links to any Django model. Compatible with Django 4.x to 5.0 and Python 3.9 to 3.12.