Update setup.cfg with description related fields

[pyrco]

Add a package description and a content type for the long_description.

(DIS-1583)

[codecov[bot]]

Codecov Report

Merging #5 (6839726) into main (22e83ae) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main       #5   +/-   ##
=======================================
  Coverage   44.73%   44.73%           
=======================================
  Files          10       10           
  Lines         836      836           
=======================================
  Hits          374      374           
  Misses        462      462           

Flag	Coverage Δ
unittests	44.73% <ø> (ø)

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