给 mmyolo dev 分支新增 15 分钟入门实例分割教程

[OpenMMLab-Assistant-004]

给 mmyolo dev 分支新增 15 分钟入门实例分割教程

参考 mmyolo 中15分钟入门目标检测写法，基于 yolov5 实例分割算法新增 15 分钟入门实例分割教程 (可以写中文或者英文版)

Task Information

Repository：MMYOLO

Difficulty：Medium

Points：30

Estimated Time Consumption：14 days

Task Status

Claimant's Github ID：Lum1104

Claim Time：2023年05月04日

PR Link：open-mmlab/mmyolo#765

Points to Note

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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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