feature: add support for models

[stigbd]

No description provided.

[codecov]

Codecov Report

Merging #13 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #13   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           12        12           
  Lines         1193      1210   +17     
=========================================
+ Hits          1193      1210   +17     

Impacted Files	Coverage Δ
src/datacatalogtordf/catalogrecord.py	100.00% <ø> (ø)
src/datacatalogtordf/distribution.py	100.00% <ø> (ø)
src/datacatalogtordf/periodoftime.py	100.00% <ø> (ø)
src/datacatalogtordf/catalog.py	100.00% <100.00%> (ø)
src/datacatalogtordf/dataset.py	100.00% <100.00%> (ø)
src/datacatalogtordf/relationship.py	100.00% <100.00%> (ø)

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