Fix: Define Person

[localheinz]

This PR

• defines a Person entity in the PersonDefinition

[codecov]

Codecov Report

Merging #80 into master will not change coverage by %.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #80   +/-   ##
=========================================
  Coverage     93.53%   93.53%           
  Complexity       76       76           
=========================================
  Files             8        8           
  Lines           201      201           
=========================================
  Hits            188      188           
  Misses           13       13           

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