Update readme.md and download script for SQuAD QA model.

examples/trials/ga_squad/download.sh

+#!/bin/bash
+
+wget https://rajpurkar.github.io/SQuAD-explorer/dataset/train-v1.1.json
+wget https://rajpurkar.github.io/SQuAD-explorer/dataset/dev-v1.1.json
+wget http://nlp.stanford.edu/data/glove.840B.300d.zip
+unzip glove.840B.300d.zip
\ No newline at end of file

examples/trials/ga_squad/readme.md

-## How to download data
+# Download data
+
+## Use downloading script
+
+Execute the following command to download needed files
+using the downloading script:
+
+```
+chmod +x ./download.sh
+./download.sh
+```
+
+## Download manually
 
 1. download "dev-v1.1.json" and "train-v1.1.json" in https://rajpurkar.github.io/SQuAD-explorer/
-2. download "glove.840B.300d.txt" in "https://nlp.stanford.edu/projects/glove/"
 
-## How to submit this job
+```
+wget https://rajpurkar.github.io/SQuAD-explorer/dataset/train-v1.1.json
+wget https://rajpurkar.github.io/SQuAD-explorer/dataset/dev-v1.1.json
+```
+
+2. download "glove.840B.300d.txt" in https://nlp.stanford.edu/projects/glove/
+
+```
+wget http://nlp.stanford.edu/data/glove.840B.300d.zip
+unzip glove.840B.300d.zip
+```
+
+# How to submit this job
 
 1. run "$NNI_ROOT_DIR/auto_run.py" as "$NNI_ROOT_DIR/README-AUTO.md" said.
 2. use the dockerImage openpai.azurecr.io/nni_v0.0.1, which means it use a tensorflow cpu-version.