title: Add CMU MoCap Dataset
comments: The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_4208). All of your documentation changes will be reflected on that endpoint. - Updated the readme.
  - Added dummy_data.zip and ran the all the tests.
  
  The dataset works for "asf/amc" and "avi" formats which have a single download link for the complete dataset. But "c3d" and "mpg" have multiple download links, can we combine and host these links on the Hub since the dataset is free to use ? "c3d" and "mpg" have multiple download links (part archives) and dl_manager.download_and_extract() extracts the files to multiple paths, is there a way to extract these multiple archives into one folder ? Any other way to go about this ?
  Can we combine and host these links on the Hub since the dataset is free to use ?
body: Resolves #3457 
  
  Dataset Request : Add CMU Graphics Lab Motion Capture dataset [#3457](https://github.com/huggingface/datasets/issues/3457)
  This PR adds the CMU MoCap Dataset.
  
  The authors didn't respond even after multiple follow ups, so I ended up crawling the website to get categories, subcategories and description information. Some of the subjects do not have category/subcategory/description as well. I am using a subject to categories, subcategories and description map (metadata file).
  
  Currently the loading of the dataset works for "asf/amc" and "avi" formats since they have a single download link. But "c3d" and "mpg" have multiple download links (part archives) and dl_manager.download_and_extract() extracts the files to multiple paths, is there a way to extract these multiple archives into one folder ? Any other way to go about this ?
  Any suggestions/inputs on this would be helpful. Thank you.
  
  
  