新增readme在文件栏上方或下方按钮

[HuYihe2008]

Please make sure of the following things

• [X] I have read the documentation.
• [X] I'm sure there are no duplicate issues or discussions.
• [X] I'm sure this feature is not implemented.
• [X] I'm sure it's a reasonable and popular requirement.

Description of the feature / 需求描述

想在样式管理中添加README显示在文件栏上方或在下方的功能按钮

Suggested solution / 实现思路

管理=》设置=》样式=》README显示位置：上方 ：下方

Additional context / 附件

No response

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[drw2005]

支持这个建议。。。

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