Add issue templates

[mcbarton]

Description

Please include a summary of changes, motivation and context for this PR.

@vgvassilev This PR should improve the quality of issues that people raise for this repo. To get an idea of what happens when people raise issues after this PR, go to my fork and try and raise an issue. People can no longer open blank issues, and instead need to fill in a template issue decided by the yml files inside the issue_template folder. I've tried to make everything in the forms to be mandatory, and should help us debug issues in future as we further develop the forms.

Fixes # (issue)

Type of change

Please tick all options which are relevant.

• Bug fix
• New feature
• Requires documentation updates

Testing

Please describe the test(s) that you added and ran to verify your changes.

Checklist

• I have read the contribution guide recently

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.15%. Comparing base (1c3f884) to head (1fe1104).
Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #378   +/-   ##
=======================================
  Coverage   76.15%   76.15%           
=======================================
  Files           8        8           
  Lines        3137     3137           
=======================================
  Hits         2389     2389           
  Misses        748      748           

[mcbarton]

@vgvassilev ping