Add issue templates

.github/workflows/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+## Bug description
+
+<!-- A clear and concise description of what the bug is. -->
+
+- [ ] I have searched the existing issues (closed & open) to make sure the issue hasn't already been reported
+- [ ] Check this box if you would like to work on a fix
+
+## To Reproduce
+
+Steps to reproduce the behavior:
+
+1. ...
+2. ...
+3. ...
+4. ...
+
+- [ ] I have reproduced the bug in main branch too
+
+## Expected behavior
+
+<!-- A clear and concise description of what you expected to happen. -->
+
+## Screenshots
+
+<!-- If applicable, add screenshots to help explain your problem. -->
+
+## Environment
+
+<!-- Please fill the following information. -->
+
+- OS: [e.g. Ubuntu 20.04]
+- espflash/cargo-espflash version: [e.g. 0.1.0]
+- Target: [e.g. ESP32-C3]
+
+## Additional context
+
+<!-- Add any other context about the problem here. -->

.github/workflows/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true

.github/workflows/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+## Motivations
+
+<!--
+If your feature request is related to a problem, please describe it.
+-->
+
+- Would you like to implement this feature? [y/n]
+
+## Solution
+
+<!-- Describe the solution you'd like. -->
+
+## Alternatives
+
+<!-- Describe any alternative solutions or features you've considered. -->
+
+## Additional context
+
+<!-- Add any other context or screenshots about the feature request here. -->