add action to generate code coverage report

.github/workflows/coverage.yml

@@ -0,0 +1,33 @@
+name: Generate Coverage Report
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  analyze:
+    name: Compute Coverage
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest]
+        python-version: [3]
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      # install deps
+      - name: Install dependencies for ${{ matrix.os }} Python ${{ matrix.python-version }}
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt
+          pip install scipy coverage
+
+      # find and run all unit tests
+      - name: Run unit tests
+        run: coverage run -m unittest discover test