Technical decision about: how to structure the repo that will contain the TestApp

[sebastianpfischer]

In order to support many different versions of the TestApp (for Rust, C, C++&FreeRTOS)
we want to define the right repository structure.

Capabilities

• it should be easy to understand what are the pre-requisite per TestApp implementation
• it should be easy to compile the TestApp for a specific platform (as a lib for example)
• it should be relative easy to provide the needed interface for the TestApp to work
• a clear documentation, well build should enable the user to select the right manual for the right TestApp (confusions should not be there!)

Acceptance Criteria
AC1: Decision taken