Add CI/CD workflows and security policy

.github/workflows/test.yml

@@ -0,0 +1,53 @@
+# Run tests on every push and pull request
+name: Tests
+
+on:
+  push:
+    branches: [main, master, develop]
+  pull_request:
+    branches: [main, master, develop]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    
+    strategy:
+      fail-fast: false  # Don't cancel other jobs if one fails
+      matrix:
+        python-version: ["3.10", "3.11", "3.12"]
+    
+    steps:
+      # 1. Get the code
+      - name: Checkout code
+        uses: actions/checkout@v4
+      
+      # 2. Set up Python
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+      
+      # 3. Install system dependencies (for pyzbar QR reading)
+      - name: Install system dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libzbar0
+      
+      # 4. Install the package with all dependencies
+      - name: Install package
+        run: |
+          python -m pip install --upgrade pip
+          pip install -e ".[dev]"
+      
+      # 5. Run tests with coverage
+      - name: Run tests
+        run: |
+          pytest --cov=stegasoo --cov-report=xml --cov-report=term-missing
+      
+      # 6. Upload coverage report (optional - integrates with codecov.io)
+      - name: Upload coverage
+        uses: codecov/codecov-action@v4
+        if: matrix.python-version == '3.11'  # Only upload once
+        with:
+          files: ./coverage.xml
+          fail_ci_if_error: false  # Don't fail if codecov is down