Add Vercel configuration

api/index.py

@@ -0,0 +1,5 @@
+from app import app as application
+
+# Vercel serverless function handler
+def handler(request, context):
+    return application(request, context)

vercel.json

@@ -0,0 +1,18 @@
+{
+  "version": 2,
+  "builds": [
+    {
+      "src": "app.py",
+      "use": "@vercel/python"
+    }
+  ],
+  "routes": [
+    {
+      "src": "/(.*)",
+      "dest": "app.py"
+    }
+  ],
+  "env": {
+    "PYTHON_VERSION": "3.9"
+  }
+}