docs(rich-text-editor): add demo and api docs (#404)

examples/docs/resources/pc/demo-config/zh-CN/rich-text-editor.json

@@ -1,10 +0,0 @@
-[
-    {
-        "title": "组件式使用",
-        "content": "详细用法参考如下示例",
-        "link": "rich-text-editor/basic-usage",
-        "component": " 富文本编辑器",
-        "findIntroStr": "富文本编辑器",
-        "demoId": "basic-usage"
-    }
-]

examples/sites/demos/app/rich-text-editor/webdoc/rich-text-editor.cn.md

@@ -0,0 +1,7 @@
+---
+title: Rich Text Editor 富文本编辑器
+---
+
+# Rich Text Editor 富文本编辑器
+
+<div>富文本编辑器可以让用户在编辑器中不仅可以编辑常规文本，同时还可以添加图像、视频、链接、表格、列表等元素，并对文本进行格式化，如加粗、斜体、下划线、字体、颜色等。</div>

examples/sites/demos/app/rich-text-editor/webdoc/rich-text-editor.en.md

@@ -0,0 +1,7 @@
+---
+title: Rich Text Editor
+---
+
+# Rich Text Editor
+
+<div>Rich text editor allows users to not only edit regular text, but also add images, videos, links, tables, lists and other elements, and format the text, such as bold, italic, underline, font, color, and so on.</div>

examples/sites/demos/app/rich-text-editor/webdoc/rich-text-editor.js

@@ -0,0 +1,33 @@
+export default {
+  column: '1',
+  owner: 'Caesar-ch',
+  demos: [
+    {
+      'demoId': 'basic-usage',
+      'name': { 'zh-CN': '基本用法', 'en-US': 'Basic Usage' },
+      'desc': { 'zh-CN': '详细用法参考如下示例', 'en-US': 'For details, see the following example.' },
+      'codeFiles': ['basic-usage.vue']
+    }
+  ],
+  apis: [
+    {
+      'name': 'rich-text-editor',
+      'type': 'component',
+      'properties': [
+        {
+          'name': 'modelValue',
+          'type': 'String',
+          'defaultValue': '',
+          desc: {
+            'zh-CN': '默认富文本内容',
+            'en-US': 'default rich text content'
+          },
+          demoId: 'basic-usage'
+        }
+      ],
+      'events': [],
+      'methods': [],
+      'slots': []
+    }
+  ]
+}