feat(Setup): Adds gitpod (#4753)

.github/CONTRIBUTING.md

@@ -37,3 +37,9 @@ npm run dev
 
 # open http://localhost:8080
 ```
+
+## Contribute from the browser with a single click
+
+You can use gitpod (A free online IDE) with a single click it will launch a ready to code workspace with dependencies pre-installed and the web server running so that you don't have to waste any time on the dev setup and start contributing straight away.
+
+[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/#https://github.com/youzan/vant)

.gitpod.yml

@@ -0,0 +1,6 @@
+tasks:
+  - init: npm run bootstrap
+    command: npm run dev
+ports:
+  - port: 8080
+    onOpen: open-preview

build/webpack.site.dev.js

@@ -12,7 +12,8 @@ module.exports = merge(config, {
     open: true,
     progress: true,
     host: '0.0.0.0',
-    stats: 'errors-only'
+    stats: 'errors-only',
+    disableHostCheck: true,
   },
   output: {
     path: path.join(__dirname, '../docs/dist'),