[add] issues templates

Author: i4004

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Connection string used (e.g. 'http://localhost:2379')
+2. Authentication settings (username/password)
+3. Action performed (browse, search, create, etc.)
+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:**
+ - OS: [e.g. Ubuntu 24.04, Windows 11]
+ - .NET Runtime version: [e.g. 10.0]
+ - etcd version: [e.g. 3.5.18]
+ - Terminal emulator: [e.g. Windows Terminal, kitty, GNOME Terminal]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: new feature
+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.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.
+
+**etcd version requirement**
+If this feature depends on a specific etcd server version (e.g., v3.6), please mention it.

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Ask some question about this project
+title: ''
+labels: question
+assignees: ''
+
+---
+
+**Describe the question**
+
+**Describe solutions you've tried**
+A description of any solutions you've already tried to solve the problem.