feat(demo)：添加富文本组件示例(#147)

[aonoa]

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[aonoa]

菜单显示有点问题

这个可能是tinymce的原因，我给那边提了issue https://github.com/tinymce/tinymce-vue/issues/399

[likui628]

先合并了，到时候在想办法修复