Better readability

[pietbrauer]

Hey currently the texts are really hard to read. Have you considered using markdown and the playground builder for the tutorials? https://github.com/jas/swift-playground-builder

[Glavin001]

+1 Those examples with markdown look awesome!

[Glavin001]

@pietbrauer I have started this here: https://github.com/Glavin001/learn-swift

I have completed migrating 1a. The Basics to Markdown for Swift Playground Builder and have updated the README to include developer instructions for using the Grunt task that automatically builds the Playgrounds on file changes in Source/ with Swift Playground Builder