First draft of possible structure for booklet with code snippets

This pull request contains a draft of how we could structure the booklet repository. The idea is the following:

The top level directory contains a README and a LICENSE information. The readme should show later what contributers need to do in order to get their pull requests accepted. The license file contains Apache2 License information. All code hosted here will be apache 2.

For each booklet there should be a corresponding folder containing a readme which describes the booklet and all snippets.