Included the gulpfile.js with the required operations

[RahulSharma4329]

I have included the gulpfile for the required operations.

However it was not defined that what functions has to be executed under watch and build so i have kept the path to be watched at the js files in "src/scripts" for an example. It can be set easily and also i have written comments as to where the code of build and watch has to be added.

[adityabisoi]

@RahulSharma4329 Functionality to watch for changes, compile images and JS.

[RahulSharma4329]

I have added the functionality of watching the change and compiling images and the javascript files using gulp. Please merge this pull request.