RFC: add issue forms

[ToucheSir]

Reference on GH docs: https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/configuring-issue-templates-for-your-repository#creating-issue-forms

[ToucheSir]

Linked to rendered template: https://github.com/FluxML/Flux.jl/blob/bde0d43c3d1cdb3f430f3e5ad9303a28acefcf65/.github/ISSUE_TEMPLATE/bug-report.yml

Live version to play with: https://github.com/ToucheSir/issue-form-example/issues/new/choose

If this format makes sense, we can add similar a similar template for feature requests.

[codecov-commenter]

Codecov Report

Merging #2011 (bde0d43) into master (97f981b) will increase coverage by 5.25%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2011      +/-   ##
==========================================
+ Coverage   81.85%   87.10%   +5.25%     
==========================================
  Files          20       20              
  Lines        1626     1528      -98     
==========================================
  Hits         1331     1331              
+ Misses        295      197      -98     

Impacted Files	Coverage Δ
src/optimise/train.jl	93.93% <0.00%> (+2.76%)	:arrow_up:
src/cuda/cudnn.jl	100.00% <0.00%> (+9.09%)	:arrow_up:
src/losses/ctc.jl	93.81% <0.00%> (+46.66%)	:arrow_up:

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[Saransh-cpp]

Asking about the OS and the Julia version would be nice too!

[ToucheSir]

The template looks a lot less intimidating once rendered. However, I stopped iterating on it because the editing experience is rather clunky (no live preview, among other things).

One simpler alternative is to clone the CUDA.jl issue templates, which are much shorter. This issue form was actually inspired by those.

[ToucheSir]

Since this was last posted, we added org-wide templates which are both less onerous to develop and to fill out.