Add issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: File a bug report
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+<!-- Please enter a short, clear description of the bug -->
+
+**To Reproduce**
+<!-- Please provide any required setup and steps to reproduce the behavior -->
+1. ...
+2. ...
+
+**Expected behavior**
+<!-- Please provide a description of what you expected to happen -->
+
+**Version Info**
+<!-- Specify version of CsWinRT NuGet, .NET SDK, Windows SDK, or other relevant info -->
+
+**Additional context**
+<!-- Enter any other applicable info here -->

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest a new feature or idea
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+<!-- This is a template for new feature requests/proposals.
+It's fine if you don't have all the details: you can start with the Summary and Rationale.
+-->
+
+# Proposal: [your title here] 
+<!-- Add a title for your proposal. Please be short and descriptive -->
+
+## Summary
+<!-- Include 1-2 sentences summarizing your feature/proposal -->
+
+## Rationale
+<!-- Create a list that describes WHY the feature should be added -->
+* {First reason for why we should consider this proposal}
+* {Second reason for why we should consider this proposal}
+* {etc}
+
+## Important Notes
+<!-- Please include any other important details.
+This could include one or more of:
+- usage examples
+- other implementation notes
+-->
+
+## Open Questions
+<!-- Please list any open issues that you think still need to be addressed. -->

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: I have a question
+title: 'Question: [your question here]'
+labels: question
+assignees: ''
+
+---
+
+<!-- Use this section to give more context for your question or other supporting materials -->