Adding new Motor Imagery Dataset

[tahatt13]

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From the issue #1 @okbalefthanded proposed to add the dataset for Motor Imagery in acute stroke patients.

Here is the link to the paper of the dataset : https://www.nature.com/articles/s41597-023-02787-8#Sec10 and the link to the dataset : https://figshare.com/articles/dataset/EEG_datasets_of_stroke_patients/21679035/5

I'll take care of adding it. For more details, look at the pull request #619