Installation:
1. install node js 
2.install npm 
3.install grunt - command: npm install -g grunt-cli




Commands:
1.add js validation/compresion : npm install grunt-contrib-jshint --save-dev
2.add htmlhint : npm install  grunt-htmlhint --save-dev
3.add html min :npm install grunt-contrib-htmlmin --save-dev
4.add less:npm install grunt-contrib-less --save-dev
5.add csslint :npm install grunt-contrib-csslint --save-dev