Add Codecov workflow for testing and coverage

Author: WhiteSymmetry

.github/workflows/codecov.yaml

@@ -0,0 +1,33 @@
+name: Run tests and upload coverage-Codecov
+
+on: 
+  push
+
+jobs:
+  test:
+    name: Run tests and collect coverage
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 2
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.11"  # ← Local makinenizde Python 3.12 kullanıyorsunuz
+
+      - name: Install dependencies
+        run: |
+          pip install pytest pytest-cov
+          pip install -e .
+
+      - name: Run tests
+        run: pytest tests/ --cov --cov-branch --cov-report=xml
+
+      - name: Upload results to Codecov
+        uses: codecov/codecov-action@v5
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          slug: WhiteSymmetry/kha256