MMSeg Readme中，添加技术文档目录索引

[OpenMMLab-Assistant-004]

MMSeg Readme中，添加技术文档目录索引

MMSeg Readme中，添加技术文档目录索引

Task Information

Repository：MMSegmentation

Difficulty：Easy

Points：20

Estimated Time Consumption：14 days

Task Status

Claimant's Github ID：AI-Tianlong

Claim Time：2023年06月01日

PR Link：open-mmlab/mmsegmentation#3083

Points to Note

To claim the task, please reply Claim the mission in the comment section. After claiming the task, please add our assistant bot called MeowMewo on WeChat at: openmmlabwx.

After completing the task, please submit a PR with the title starting with [MMSIG]. After submission, please reply with your PR link in the comments section of this Discussion. We will review your work as soon as possible.

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