add github issue_template & pull_request_template

[Janell-Huyck]

Fixes #170
This PR creates a new folder and 2 files. GitHub has the ability to configure templates, but there is also a new beta feature that will allow us to use .yml files to create forms for issue submission. This PR has 2 .md files, echoing the set up in our app ucrate. In the future, we may want to switch over to .yml form submission for issues, but putting in the template as .md files instead of a GitHub configuration moves us in that direction while increasing congruence between our apps.

I imported over the ISSUE_TEMPLATE and the PULL_REQUEST_TEMPLATE that are already in use in ucrate.

[crowesn]

"It is possible to manually create a single issue template in Markdown using the legacy issue template workflow, and project contributors will automatically see the template's contents in the issue body. However, we recommend using the upgraded multiple issue template builder or issue forms to create issue templates. For more information about the legacy workflow, see" source

If we could, I think it would be worth migrating our legacy template to the new yaml format. Are we able to do that with a single template?

[crowesn]

I took a closer look and you're correct: issue forms (yaml) are in beta. I was confused and the documentation I was looking at was recommending use of multiple issue template builder which is not in the scope of what we want. Merging.