Add contributing reference + issue and PR templates

[ryanoasis]

These really need to be added to help with contributing and help 😊

I am thinking something similar to what I have here: https://github.com/ryanoasis/vim-devicons/tree/issue_pr_templates/.github

^ some of the ideas were from React's templates ... I do not recall others I got ideas from

If anyone else has any suggestions or examples for improving the clarity for contributing or documentation in general just ping me on this issue

reference: mentioned/reminded by @jrolfs in gitter chat.

[github-actions]

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