Added additional exercises
Added additional exercises

jennifer-mann/gdi-intro-javascript,gdirdu/gdi-intro-javascript,amandagogogo/gdicincy-intro-js,girldevelopit/gdi-featured-js-intro,Roenok/gdi-intro-javascript,anythingcodes/gdi-featured-js-intro,gdirdu/gdi-intro-javascript,jennifer-mann/gdi-intro-javascript,anythingcodes/gdi-featured-js-intro,amandagogogo/gdicincy-intro-js,girldevelopit/gdi-featured-js-intro,Roenok/gdi-intro-javascript