example files for MAP building with required fields and instructions

[sophie22]

Linked Issue(s)

#78

Summary of changes

Added the required (app.py, app_config.json, app_requirements.txt and the operators in a folder) and additional example files (operators) for MAP building process. app.py has sections indicated with TODO where project-specific code should replace the example lines.

Reason for changes

Extend functionality and guidance for MAP building once model training is completed.

The code does NOT work, it is purely for example and guidance purposes. Sections that need to be adapted to a given project are indicated with TODO and marked as example throughout.