Adding jQuery

1. Explain CDN (Content Delivery Network) and pros/cons
2. jQuery from CDN will be used for all exercises.

JQuery Basics:

1. Selectors with JQuery
   
   • Using an element/tag as a selector: $('element')
   • Using an element's id as a selector: $('#id-name')
   • Using an element's class as a selector: $('.class-name')
2. DOM Manipulation with jQuery
   • text
     • get: $('div').text();
     • set: $('div').text('text string');
     .text video example
   • html
     • get: $('div').html();
     • set: $('div').html('<h1>html string</h1>');
     .html video example
   • append / prepend
     • append: $('div').append('<h1>html string</h1>');
       • Inserts content to the end of element.
     • 
       
     • prepend: $('div').prepend('<h1>html string</h1>');
       • Inserts content to the beginning of element.
       apprend/prepend video example