Update README.MD

upload files for ex8_cofi notebook

Update README.MD

Uploaded datasets for ex8 notebook

move ex8 noteboook to ex8 folder

added ex8 notebook

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Fixed spelling issue in ex7_pca notebook

Update README to include ex7_pca description.

add files for ex7_pca notebook

Update README.md

Update Readme.md

add data and images files to ex7 folder

delete small_bird.png

delete kmeans.png