Added grader and checks.json files
Updated checks.json file
Grader to accept url v1
Add grader.js
Add code to pass url to grader
Add code to pass url to grader
Add code to pass url to grader
Add code to pass url to grader
Add code to pass url to grader
Add code to pass url to grader
Add code to pass url to grader
Add code to pass url to grader
Adding new index.html for hw4
Adding new index.html for hw4