Added <PCA / KLT> to main doc
Create <README.md> in <PCA>
Update README.md
Update README.md

Refactored <What is used for?> section
Code first draft and image output for doc
Better fileName fore code
Image of dataset
Image of pca
Coloured output text for better readability
Improved code appearance
Update README.md

Added dimensionality reduction case study
Added dim comment to <X_hat>
Update README.md
Update README.md

Added <correlation> obserbation
Added images for <zca>
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Added ZCA whitening section
Added ZCA to code
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Typos
Added <Index> to PCA doc
Added images for "pepper" aligned perturbation