[Doc] add design resource (#3027)

docs/src/doc.config.js

@@ -51,6 +51,10 @@ module.exports = {
                 path: '/contribution',
                 title: '开发指南'
               },
+              {
+                path: '/design',
+                title: '设计资源'
+              },
               {
                 path: '/style-guide',
                 title: '风格指南'

docs/src/docs-entry.js

@@ -4,6 +4,7 @@ export default {
   'changelog.en-US': () => import('../markdown/changelog.en-US.md'),
   'changelog.zh-CN': () => import('../markdown/changelog.zh-CN.md'),
   'contribution.zh-CN': () => import('../markdown/contribution.zh-CN.md'),
+  'design.zh-CN': () => import('../markdown/design.zh-CN.md'),
   'intro.en-US': () => import('../markdown/intro.en-US.md'),
   'intro.zh-CN': () => import('../markdown/intro.zh-CN.md'),
   'quickstart.en-US': () => import('../markdown/quickstart.en-US.md'),