Create an issue template

[wmcheung]

https://dev.to/github/how-to-build-google-like-forms-with-github-3ig2

Creating an issue template can guide the writer to write an issue in the provided structure which is dicussed and agreed upon by developers and admins.

Reason: newly created issues provide no guidelines and will take more admin to collect thoughts behind the issue before initiating community voting and bounty creation.