add support for Net5 and Net6

[AzureView]

Hi,
Can you please review this pull request to add support for net5 and net6, keeping support for netcore3.1.
Regards Derek

[AzureView]

will reopen with correction

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@0d1ca5d). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #134   +/-   ##
=======================================
  Coverage        ?   68.66%           
=======================================
  Files           ?       51           
  Lines           ?     1433           
  Branches        ?      149           
=======================================
  Hits            ?      984           
  Misses          ?      381           
  Partials        ?       68           

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