Add issue templates

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug report
+about: Create a report about a bug in this implementation.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## Environment
+
+* OS:
+* age-plugin-yubikey version:
+
+## What were you trying to do
+
+## What happened
+
+```
+<insert terminal transcript here>
+```

.github/ISSUE_TEMPLATE/ux-report.md

@@ -0,0 +1,21 @@
+---
+name: UX report
+about: Was age-plugin-yubikey hard to use? It's not you, it's us. We want to hear about it.
+title: 'UX: '
+labels: 'UX report'
+assignees: ''
+
+---
+
+<!-- Did age-plugin-yubikey not do what you expected?
+Was it hard to figure out how to do something?
+Could an error message be more helpful?
+It's not you, it's us. We want to hear about it. -->
+
+## What were you trying to do
+
+## What happened
+
+```
+<insert terminal transcript here>
+```