chore: add codecov integration into the project

Author: danielbarion

.github/workflows/codecov.yaml

@@ -0,0 +1,36 @@
+name: Codecov
+
+on: [push]
+
+jobs:
+  run:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    env:
+      OS: ${{ matrix.os }}
+      PYTHON: '3.7'
+    steps:
+      - uses: actions/checkout@master
+      - name: Setup Python
+        uses: actions/setup-python@master
+        with:
+          python-version: 3.7
+      - name: Generate coverage report
+        run: |
+          pip install pytest
+          pip install pytest-cov
+          pytest --cov=./ --cov-report=xml
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v3
+        with:
+          # token: ${{ secrets.CODECOV_TOKEN }}
+          directory: ./coverage/reports/
+          env_vars: OS,PYTHON
+          fail_ci_if_error: true
+          files: ./coverage1.xml,./coverage2.xml
+          flags: unittests
+          name: codecov-umbrella
+          path_to_write_report: ./coverage/codecov_report.txt
+          verbose: true