feat(example/mnist): added README.md

example/mnist/README.md

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+# Linear Regression, NN, and CNN on MNIST dataset
+
+## MNIST
+
+- MNIST files can be obtained at [This source](http://yann.lecun.com/exdb/mnist/) and put in `data/mnist` from
+    root folder of this project.
+
+- Load MNIST data using helper function at `vision` sub-package
+
+## Linear Regression
+
+- Run with `go clean -cache -testcache && go run main.go linear`
+
+- Accuraccy should be about **91.68%**.
+
+
+## Neural Network (NN)
+
+TODO: update
+
+
+## Convolutional Neural Network (CNN)
+
+TODO: update
+
+
+
+