Add a simple readme to MNIST example
Add a simple readme to MNIST example

okuta/chainer,keisuke-umezawa/chainer,wkentaro/chainer,niboshi/chainer,jnishi/chainer,wkentaro/chainer,wkentaro/chainer,ktnyt/chainer,niboshi/chainer,hvy/chainer,chainer/chainer,ktnyt/chainer,okuta/chainer,jnishi/chainer,tkerola/chainer,pfnet/chainer,okuta/chainer,keisuke-umezawa/chainer,hvy/chainer,wkentaro/chainer,keisuke-umezawa/chainer,hvy/chainer,niboshi/chainer,niboshi/chainer,jnishi/chainer,okuta/chainer,jnishi/chainer,keisuke-umezawa/chainer,hvy/chainer,ktnyt/chainer,chainer/chainer,chainer/chainer,chainer/chainer,ktnyt/chainer