Add bug_report.md

Author: ashtanko

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: 🐞 Bug Report
+about: Report a Flutter-related bug to help us improve
+title: "[Bug] <short description>"
+labels: bug
+assignees: ''
+
+---
+
+### 🐛 Describe the bug
+A clear and concise description of the bug you're experiencing.
+
+---
+
+### 🔁 Reproduction Steps
+Please list the minimal steps to reproduce the bug:
+1. `flutter clean`
+2. Run `flutter pub get`
+3. Navigate to '...'
+4. Click on '...'
+5. Observe the error
+
+---
+
+### 🤔 Expected behavior
+What did you expect to happen?
+
+---
+
+### 📸 Screenshots / Logs
+If applicable, add screenshots or terminal output that help explain the issue.
+
+---
+
+### 🧪 Test Environment
+Please complete the following information:
+
+- **Flutter Version:**  
+  Run `flutter --version` and paste the output here.
+
+- **Device:**  
+  e.g., Pixel 6, iPhone 14 Pro
+
+- **OS:**  
+  Android / iOS / Web / macOS / Windows / Linux
+
+- **Channel:**  
+  stable / beta / dev / master
+
+---
+
+### 📝 Additional context
+Add any other relevant context about the bug here (e.g., dependencies used, packages involved).
+
+---
+
+### ✅ Checklist
+- [ ] I have run `flutter clean` and `flutter pub get`
+- [ ] I have tried to reproduce this issue on a physical device and/or emulator
+- [ ] I have checked for similar issues in the [existing issues list](../../issues)