added a GitHub action to run unit tests automatically on code push

.github/workflows/unittests.yaml

@@ -0,0 +1,16 @@
+name: Continuous Integration
+on: [push]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.10.0
+          architecture: x64
+      - name: Install dependencies
+        run: pip install -r requirements.txt 
+      - name: Run Tests
+        run: python -m pytest