Add GitHub issue templates for bug reports and feature requests

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve the Copilot Token Tracker extension
+title: '[BUG] '
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**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 complete the following information):**
+- OS: [e.g. Windows 11, macOS Sonoma, Ubuntu 22.04]
+- VS Code Version: [e.g. 1.95.0]
+- Extension Version: [e.g. 0.0.1]
+- GitHub Copilot Extension Version: [e.g. 1.140.0]
+
+**Copilot Usage Context:**
+- Do you use GitHub Copilot on multiple machines? [Yes/No]
+- Do you use GitHub Copilot in the web version? [Yes/No]
+- Approximately when did you first install GitHub Copilot Chat? [e.g. 3 months ago]
+
+**Additional context**
+Add any other context about the problem here.
+
+**Logs (if applicable)**
+If the extension shows unexpected behavior, you can help by sharing:
+- Any error messages from VS Code Developer Tools (Help > Toggle Developer Tools)
+- Contents of VS Code output panel for "Copilot Token Tracker" (if available)

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for the Copilot Token Tracker extension
+title: '[FEATURE] '
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Use case**
+Describe how this feature would be used and who would benefit from it.
+
+**Mockups/Screenshots (if applicable)**
+If you have ideas for UI changes or new displays, add mockups or sketches to help explain your vision.
+
+**Priority**
+How important is this feature to you?
+- [ ] Critical - I can't use the extension effectively without this
+- [ ] High - This would significantly improve my experience
+- [ ] Medium - This would be a nice addition
+- [ ] Low - This is just a suggestion
+
+**Implementation considerations**
+Are there any technical considerations or constraints you're aware of? For example:
+- Performance implications
+- Cross-platform compatibility (Windows/macOS/Linux)
+- Integration with other VS Code extensions
+- Data privacy concerns
+
+**Additional context**
+Add any other context, links to similar features in other tools, or screenshots about the feature request here.