chore(docs): add link to demo
chore(docs): add link to demo

raphaelcunha/browser-code,r-park/todo-angular2-firebase,zalando/zalmemo,goekhanak/zalmemo,marasco/startupmanager,marasco/startupmanager,r-park/todo-angular2-firebase,r-park/todo-angular-firebase,marasco/startupmanager,zalando/zalmemo,raphaelcunha/browser-code,marasco/startupmanager,zalando/zalmemo,r-park/todo-angular-firebase,r-park/todo-angular2-firebase,r-park/todo-angular-firebase,goekhanak/zalmemo,goekhanak/zalmemo,zalando/zalmemo,goekhanak/zalmemo