从2021年3月起，现在支持:

将文件附加到标记文件

You can now attach files, including images, to markdown files while you're editing them in the web. This works just like file attachments in issues and pull requests and supports the same file types. Just drag and drag, click and select, or paste. Note: If you add an image to a markdown file, anyone can view the anonymized image URL without authentication, even if the markdown file is in a private repository. To keep images private, serve them from a private network or server that requires authentication. For more information on anonymized URLs see "About anonymized image URLs".

方法1->降价方式

![Alt Text](https://raw.github.com/{USERNAME}/{REPOSITORY}/{BRANCH}/{PATH})

方法2->HTML方式

<img src="https://link(format same as above)" width="100" height="100"/>

or

<img src="https://link" style=" width:100px ; height:100px " />

如果你不想样式你的图像，即调整大小，删除样式部分

使用位于/screen-shots目录中的图像。外部的<div>允许图像被定位。填充是使用<img width="desired-padding" height="0">实现的。

<div align="center">
        <img width="45%" src="screen-shots/about.PNG" alt="About screen" title="About screen"</img>
        <img height="0" width="8px">
        <img width="45%" src="screen-shots/list.PNG" alt="List screen" title="List screen"></img>
</div>

下面一行应该就是你要找的内容

如果文件在存储库中

![ScreenShot](https://raw.github.com/{username}/{repository}/{branch}/{path})

如果您的文件在其他外部url

![ScreenShot](https://{url})

在存储库中从上传文件选项添加图像，然后在README文件中

![Alt text]("enter image url of repositoryhere") 

2020年6月3日:工作答案-

把你的图片上传到postmage.org 上传图片后复制Github-Markdown-Url 插入你的ReadMe