gh: add issue templates

.github/ISSUE_TEMPLATE/bug-report---.md

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+---
+name: "Bug report \U0001F41E"
+about: Create a report to help us improve
+
+---
+
+## Description
+
+Describe the issue that you're seeing.
+
+### Steps to reproduce
+
+Clear steps describing how to reproduce the issue. Please please please link to a demo project if possible, this makes your issue _much_ easier to diagnose (seriously).
+
+### Expected result
+
+What should happen?
+
+### Actual result
+
+What happened.
+
+### Environment
+
+Paste the information here as shown by `hyas info`

.github/ISSUE_TEMPLATE/feature-request---.md

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+---
+name: "Feature request \U0001F680"
+about: Suggest an idea for Hyas
+
+---
+
+## Summary
+
+Brief explanation of the feature.
+
+### Basic example
+
+Include a basic example or links here.
+
+### Motivation
+
+Why are we doing this? What use cases does it support? What is the expected outcome?