feat: initialize flask app skeleton

tests/test_app_factory.py

@@ -0,0 +1,18 @@
+import unittest
+
+from app import create_app
+
+
+class AppFactoryTest(unittest.TestCase):
+    def test_health_check_returns_ok(self):
+        app = create_app({"TESTING": True})
+        client = app.test_client()
+
+        response = client.get("/health")
+
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.get_json(), {"ok": True})
+
+
+if __name__ == "__main__":
+    unittest.main()