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feat(challenge12): add challenge 12 scroll cd

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thomas
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apps/scroll-cd/README.md
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### Information
This challenge will teach you how to avoid unnecessary change detection cycles.
In this challenge, you will need to optimize the change detection cycles run by Angular.
Zone.js will trigger a change detection cycle each time a scroll event is dispatched. However we only want to show or hide a button at a specific scroll position. Therefore, we only want to refresh our application once.
> You can vizualise how many times CD is triggered by installing the [Angular chrome devTool](https://chrome.google.com/webstore/detail/angular-devtools/ienfalfjdbdpebioblfackkekamfmbnh) and starting a new recording on the profiler tab.
The following video will explain what is the goal of this challenge.
### Statement
Your goal for this challenge is to avoid all those unnecessary change detection cycle and trigger a CD only when needed.