Diagnostic report resource added

[pipliggins]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 98.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 97.71%. Comparing base (627c07e) to head (e721389).
Report is 1 commits behind head on main.

Files	Patch %	Lines
fhirflat/resources/diagnosticreport.py	96.42%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #65   +/-   ##
=======================================
  Coverage   97.70%   97.71%           
=======================================
  Files          40       42    +2     
  Lines        1962     2010   +48     
=======================================
+ Hits         1917     1964   +47     
- Misses         45       46    +1     

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