Update README.md

Author: SoloSynth1

README.md

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 # neural-network-for-mnist
 A 3-layer neural network to differentiate handwritten digits in MNIST database
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+The network utilises MNIST data (in CSV format) to train itself and test data is feed in afterwards to show the network's ability to differentiate new and not-seen-before digit images.
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+MNIST data uploaded along with the .py file. They are downloaded from mnist-in-csv (https://pjreddie.com/projects/mnist-in-csv/). The original MNIST data in, .ubyte format, can be found here: http://yann.lecun.com/exdb/mnist/. 
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+This project is made possible by the guidance on building a 3-layer neural network as illustrated by Mr. Tariq Rashid in his work Make Your Own Neural Network. (https://www.amazon.com/gp/product/B01EER4Z4G)