chore(github): add issue templates (#276)

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug Report 错误报告
+about: Create a bug report 创建一个错误报告
+title: "[BUG] Some problem..."
+labels: bug
+assignees: dillonzq
+
+---
+
+### Describe the bug 描述你遇到的错误
+
+A clear and concise description of what the bug is.
+一段简短的对于你遇到的错误的描述.
+
+### Expected behavior 期待的行为
+
+A clear and concise description of what you expected to happen.
+一段简短的对于你期待的行为的描述.
+
+### Screenshots 屏幕截图
+
+If applicable, add screenshots to help explain your problem.
+如果可以的话, 提供屏幕截图对解决问题很有帮助.
+
+### Build Environment 构建环境
+
+- OS: [e.g. Windows 10, macOS, Ubuntu]
+- Theme version/commit [e.g. 0.2.0, 2ccba79]
+- Hugo version [e.g. 0.69.0]
+
+Please use Hugo **extended** version.
+请使用 Hugo **extended** 版本.
+
+### Preview Environment 预览环境
+
+- OS: [e.g. Windows 10, macOS, Ubuntu, iOS, Android]
+- Browser [e.g. Chrome, Safari, Firefox]
+
+### Additional Information 补充信息
+
+Configuration files or front matter code...
+配置文件或者前置参数的代码...

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Theme Documentation
+    url: https://hugoloveit.com/categories/documentation/
+    about: Please read the documentation carefully.

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: Feature request 功能请求
+about: Suggest an idea for this project 为这个项目提供一个建议
+title: "[FEATURE] Some feature"
+labels: enhancement
+assignees: dillonzq
+
+---
+
+### Describe the feature you want 描述你的功能需求
+
+- Feature 1
+  I want this feature to solve ...
+- Feature 2
+  I want this feature to solve ...
+- ...
+
+### Useful reference 有价值的参考
+
+If available, provide useful links to fulfill the feature.
+如果可以的话, 提供实现这个功能的参考链接.