Add addDocuments API and overwrite option.

[davidlehn]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (5917532) to head (d8b83b5).

Additional details and impacted files

@@             Coverage Diff             @@
##             main       #15      +/-   ##
===========================================
+ Coverage   98.40%   100.00%   +1.59%     
===========================================
  Files           2         2              
  Lines         125       143      +18     
===========================================
+ Hits          123       143      +20     
+ Misses          2         0       -2     

Files	Coverage Δ
lib/JsonLdDocumentLoader.js	100.00% <100.00%> (+1.66%)	⬆️

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[dlongley]

Approving with one suggestion for the new API.

[davidlehn]

Backed out the overwrite option for now to avoid breaking change.