Fix: Configure mapping for classes used as entities

[localheinz]

This PR

• configures the mapping for classes used as entities

Blocks #33.

[codecov]

Codecov Report

Merging #39 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #39   +/-   ##
=========================================
  Coverage     61.85%   61.85%           
  Complexity       80       80           
=========================================
  Files             8        8           
  Lines           194      194           
=========================================
  Hits            120      120           
  Misses           74       74

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