chore(github) Update issue templates

This patch provides issue templates. It's a mix between Github defaults, and https://github.com/rustwasm/wasm-bindgen templates.

Thoughts?

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

@@ -0,0 +1,37 @@
+---
+name: "\U0001F41E Bug report"
+about: Create a report to help us improve
+title: ''
+labels: "\U0001F6A8 \U0001F41E bug"
+assignees: ''
+
+---
+
+Thanks for the bug report!
+
+### Describe the bug
+
+A clear and concise description of what the bug is.
+
+### Steps to reproduce
+
+1. Go to '…'
+2. Compile with '…'
+3. Run '…'
+4. See error
+
+If applicable, add a link to a test case (as a zip file or link to a repository we can clone).
+
+### Expected behavior
+
+A clear and concise description of what you expected to happen.
+
+### Actual behavior
+
+A clear and concise description of what actually happened.
+
+If applicable, add screenshots to help explain your problem.
+
+### Additional context
+
+Add any other context about the problem here.

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

@@ -0,0 +1,26 @@
+---
+name: "\U0001F389 Feature request"
+about: Suggest an idea for this project
+title: ''
+labels: "\U0001F389 enhancement"
+assignees: ''
+
+---
+
+Thanks for proposing a new feature!
+
+### Motivation
+
+A clear and concise description of what the motivation for the new feature is, and what problem it is solving.
+
+### Proposed solution
+
+A clear and concise description of the feature you would like to add, and how it solves the motivating problem.
+
+### Alternatives
+
+A clear and concise description of any alternative solutions or features you've considered, and why you're proposed solution is better.
+
+### Additional context
+
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/--question.md

@@ -0,0 +1,16 @@
+---
+name: "❓ Question"
+about: Ask a question about this project
+title: ''
+labels: "❓ question"
+assignees: ''
+
+---
+
+### Summary
+
+A clear and concise summary of your question.
+
+### Additional details
+
+Provide any additional details here.

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,35 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: "\U0001F6A8 \U0001F41E bug"
+assignees: ''
+
+---
+
+### Describe the Bug
+
+A clear and concise description of what the bug is.
+
+### Steps to Reproduce
+
+1. Go to '…'
+2. Compile with '…'
+3. Run '…'
+4. See error
+
+If applicable, add a link to a test case (as a zip file or link to a repository we can clone).
+
+### Expected Behavior
+
+A clear and concise description of what you expected to happen.
+
+### Actual Behavior
+
+A clear and concise description of what actually happened.
+
+If applicable, add screenshots to help explain your problem.
+
+### Additional Context
+
+Add any other context about the problem here.