adding capability to call graphQL APIs from node

[rajeshgupta723]

Steps to compile and run the sample grqphQL API program from terminal:
(get latest from the branch repo. Your API token must have the required oauth scopes to call the graphQL API)

1. git pull
2. run "npm install"
3. cd "sample" folder
4. Edit code graphqlClient.js -- to update your API_TOKEN = "";
5. run "npm install"
6. run "node graphqlClient.js"