Develop first example script to access metadata and data

* Example scripts intend to explain the API of the HIFIS-Surveyval
Framework.
* Most important methods are explained in the context of examples 
given.
* Comments should give as much context and reference as needed to
understand analysis scripts as well as developing own analysis
scripts.
* Here examples are provided that demonstrate how to access
metadata and data from the DataContainer object passed in into
each analysis scripts.
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