add module docstring for FashionMNIST

Author: Evizero

docs/src/datasets/FashionMNIST.md

@@ -87,6 +87,10 @@ julia> FashionMNIST.convert2image(FashionMNIST.traintensor(1)) # first training
 
 ## API Documentation
 
+```@docs
+FashionMNIST
+```
+
 ### Trainingset
 
 ```@docs

src/FashionMNIST/FashionMNIST.jl

@@ -1,4 +1,28 @@
 export FashionMNIST
+
+"""
+Fashion-MNIST
+
+- Authors: Han Xiao, Kashif Rasul, Roland Vollgraf
+- Website: https://github.com/zalandoresearch/fashion-mnist
+
+Fashion-MNIST is a dataset of Zalando's article images—consisting
+of a training set of 60,000 examples and a test set of 10,000
+examples. Each example is a 28x28 grayscale image, associated
+with a label from 10 classes. It can serve as a drop-in
+replacement for MNIST.
+
+## Interface
+
+- [`FashionMNIST.traintensor`](@ref), [`FashionMNIST.trainlabels`](@ref), [`FashionMNIST.traindata`](@ref)
+- [`FashionMNIST.testtensor`](@ref), [`FashionMNIST.testlabels`](@ref), [`FashionMNIST.testdata`](@ref)
+
+## Utilities
+
+- [`FashionMNIST.download`](@ref)
+- [`MNIST.convert2features`](@ref)
+- [`MNIST.convert2image`](@ref)
+"""
 module FashionMNIST
     using DataDeps
     using FixedPointNumbers