chore: add issue templates

.github/ISSUE_TEMPLATE/bug.md

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+---
+name: 🐛 Bug report
+labels: 'bug'
+about: Create a report to help us improve
+---
+
+## 🐛 Bug Report
+
+(A clear and concise description of what the bug is.)
+
+## To Reproduce
+
+Steps to reproduce the behavior:
+
+## Expected behavior
+
+(A clear and concise description of what you expected to happen.)
+
+## Link to repro (highly encouraged)
+
+(Please provide either a [CodeSandbox demo](https://codesandbox.io) or an example GitHub repo.)
+
+## Environment
+
+- `reframe` v0.x.x
+- `@reframe/cli` v0.x.x

.github/ISSUE_TEMPLATE/feature.md

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+---
+name: 🚀 Feature Proposal
+labels: 'enhancement'
+about: Submit a proposal for a new feature
+---
+
+## 🚀 Feature Proposal
+
+(A clear and concise description of what the feature is.)
+
+## Motivation
+
+(Please outline the motivation for the proposal.)
+
+## Example
+
+(Please provide an example for how this feature would be used.)

.github/ISSUE_TEMPLATE/question.md

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+---
+name: 🤓 Question
+labels: 'question'
+about: Ask the maintainers (as a last resort)
+---
+
+## 🤓 Question
+
+(You _must_ search the issues before asking your question. Consider asking in [the official Discord chat](https://discordapp.com/invite/kqXf65G) and/or [Stack Overflow](https://stackoverflow.com) first.)