build: added CI workflow

.github/workflows/ci-cd.yml

@@ -0,0 +1,33 @@
+name: ci-cd
+
+on: [push, pull_request]
+
+jobs:
+  ci:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Set up Python 3.9
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.9
+
+    - name: Check-out repository
+      uses: actions/checkout@v2
+
+    - name: Install poetry
+      uses: snok/install-poetry@v1
+
+    - name: Install package
+      run: poetry install
+
+    - name: Test with pytest
+      run: poetry run pytest tests/ --cov=pycounts --cov-report=xml
+
+    - name: Use Codecov to track coverage
+      uses: codecov/codecov-action@v2
+      with:
+        files: ./coverage.xml 
+
+    - name: Build documentation
+      run: poetry run make html --directory docs/