Update README.md

Author: HGS-eiturrat

README.md

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-# mnist-data
+# MNIST Dataset
+
+A collection of handwritten digits used by IDL's classify_digits.pro
+
+Originally available at http://yann.lecun.com/exdb/mnist/
+
+The MNIST database of handwritten digits has a training set of 60,000 examples, and a test set of 10,000 examples. The digits have been size-normalized and centered in a fixed-size image.
+
+It is a good database for people who want to try learning techniques and pattern recognition methods on real-world data while spending minimal efforts on preprocessing and formatting.