Rollup merge of #68413 - XAMPPRocky:master, r=Mark-Simulacrum

Rollup merge of #68413 - XAMPPRocky:master, r=Mark-Simulacrum

Add GitHub issue templates

This PR adds GitHub's issue templates to the repository. Adding templates for two of the most common issues we create on the repository. We could add more specific templates (e.g. ICEs) depending on the response to initial templates. I've included a screenshot of what it looks like, and people can also try out the UI and specific templates, by going to [`XAMPPRocky/rust`](https://github.com/XAMPPRocky/rust/issues/new/choose).

<img width="1115" alt="Screenshot 2020-01-21 at 13 57 46" src="https://user-images.githubusercontent.com/4464295/72807027-c51baa00-3c56-11ea-8a4c-98238489b345.png">