Add bug report issue template

[sjspielman]

Purpose

This PR adds a bug report issue template.

Issue Addressed

Closes #29

Any comments, concerns, or questions important for reviewers

Let me know what you think about section headers as well as guiding comments!

[jaclyn-taroni]

Content looks good. Putting the descriptions in the HTML comment, rather than italics, could be a point of confusion if you are not used to writing in Markdown. I say you file a ticket to evaluate that practice holistically before launch.

[sjspielman]

Content looks good. Putting the descriptions in the HTML comment, rather than italics, could be a point of confusion if you are not used to writing in Markdown. I say you file a ticket to evaluate that practice holistically before launch.

I filed an issue for that here #164!

One thought I have on this - we plan to include some docs about using markdown (see #36). Maybe it would be helpful to actually include at the top of each issue template something like:

Welcome to the issue template! It's written in markdown <link to markdown docs>. HTML comments give instructions for how to fill this out. You can click the "Preview" button anytime to see how this renders. Learn more about issues in OpenScPCA <from these docs about issues>.