docs: update README and add test infrastructure

- Enhance .gitignore with comprehensive Python patterns
- Improve README with better setup and testing instructions
- Add test infrastructure:
  * Test requirements file
  * Environment setup script
  * Test runner script
  * Comprehensive test suite
  * Coverage configuration

tests/conftest.py

@@ -0,0 +1,48 @@
+import pytest
+from fastapi.testclient import TestClient
+from main import app
+
+@pytest.fixture(scope="module")
+def test_client():
+    """Create a test client for the FastAPI app."""
+    with TestClient(app) as client:
+        yield client
+
+@pytest.fixture
+def mock_valid_token_payload():
+    """Mock payload for a valid JWT token."""
+    return {
+        "iss": "https://login.infomaniak.com",
+        "aud": "test-client-id",
+        "sub": "1234567890",
+        "email": "rene.luria@infomaniak.com",
+        "exp": 9999999999,
+        "iat": 1609459200
+    }
+
+@pytest.fixture
+def mock_invalid_token_payload():
+    """Mock payload for an invalid JWT token."""
+    return {
+        "iss": "https://invalid.issuer.com",
+        "aud": "wrong-client-id",
+        "sub": "1234567890",
+        "email": "unauthorized@example.com",
+        "exp": 9999999999,
+        "iat": 1609459200
+    }
+
+@pytest.fixture
+def mock_jwks():
+    """Mock JWKS for token validation."""
+    return {
+        "keys": [
+            {
+                "kty": "RSA",
+                "kid": "test-key-id",
+                "use": "sig",
+                "n": "test-modulus",
+                "e": "AQAB"
+            }
+        ]
+    }