github: add issue templates

[sergiusens]

• [ ] Have you followed the guidelines for contributing?
• [ ] Have you signed the CLA?
• [ ] Have you successfully run tox?

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[codecov[bot]]

Codecov Report

Merging #88 (14769ef) into main (1c354f2) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #88   +/-   ##
=======================================
  Coverage   90.44%   90.44%           
=======================================
  Files          13       13           
  Lines         659      659           
  Branches      131      131           
=======================================
  Hits          596      596           
  Misses         47       47           
  Partials       16       16