ci: add GitHub Actions workflow for Python SDK testing, linting, and type checking.

Author: marwan562

.github/workflows/ci.yml

@@ -0,0 +1,40 @@
+name: CI - fintech-sdk-python
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
+    
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -e .[dev]
+
+      - name: Run Tests
+        run: |
+          python -m pytest
+
+      - name: Lint
+        run: |
+          python -m flake8 .
+          python -m black --check .
+          python -m isort --check-only .
+
+      - name: Type Check
+        run: |
+          python -m mypy .