Began adding unit tests

.github/workflows/ci.yaml

@@ -0,0 +1,29 @@
+name: Audio Separator CI
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.11"
+      - name: Display Python version
+        run: python -c "import sys; print(sys.version)"
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install pytest
+
+      - name: Run unit tests
+        run: pytest tests/unit
+
+      # - name: Run integration tests
+      #   run: pytest tests/integration
+      # - name: Run end-to-end tests
+      #   run: pytest tests/end_to_end