Added the note of class DataFrame
Added the note of class DataFrame, if the data type is torch.Tensor when creating DataFrame, it should be converted to Numpy Array for better performance.
More More detailed description in https://github.com/pandas-dev/pandas/issues/44616.
Originally, the judgment was added directly in the init method of DataFrame: whether data is torch.Tensor
if isinstance(data,torch.Tensor):
     data = data.numpy()
This can solve the time-consuming problem of DataFrame (tensor), but need to import torch, which may affect other uses of pandas, so it is more appropriate to add an explanation in the class comment. 
Hello @YeahNew! Thanks for updating this PR. We checked the lines you've touched for [PEP 8](https://www.python.org/dev/peps/pep-0008) issues, and found:



There are currently no PEP 8 issues detected in this Pull Request. Cheers! :beers: 

##### Comment last updated at 2021-12-02 07:36:46 UTC closing as won't fix. I don't find this a useful doc addition; discussed in the original issue.