Support image captioning task with COCO Caption dataset 多模态数据集文档补充 - COCO Caption

[OpenMMLab-Assistant-004]

Support image captioning task with COCO Caption dataset

多模态数据集文档补充 - COCO Caption

Support image captioning task with COCO Caption dataset
Added dataset support in MMPreTrain, please add corresponding directory structure and usage examples in the docstring.

支持 图像描述任务 COCO Caption 数据集
MMPreTrain 中添加了数据集支持，需要在 docstring 中补充相应的目录结构、使用示例等说明

Task Information

Repository：MMPreTrain

Difficulty：Easy

Points：10

Estimated Time Consumption：7 days

Task Status

Claimant's Github ID：None

Claim Time：None

PR Link：None

Points to Note

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