add vercel.json

Author: litongjava

vercel.json

@@ -0,0 +1,12 @@
+{
+  "version": 2,
+  "builds": [
+    {
+      "src": "package.json",
+      "use": "@vercel/static-build",
+      "config": {
+        "outputDirectory": "docs/.vuepress/tio-boot-docs"
+      }
+    }
+  ]
+}