ci: add issue template (#219)

.github/ISSUE_TEMPLATE/bug-report.yml

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+name: Bug report
+description: Create a report to help us improve
+title: '[Bug]'
+labels:
+  - bug
+assignees: pengzhanbo
+body:
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: Checklist
+      description: |-
+        Make SURE that you follow these statements.
+      options:
+        - label: I am using **LTS** version of Node.js.
+          required: true
+
+        - label: I am using the **latest v2 version** of VuePress and VuePress official plugins.
+          required: true
+
+        - label: I am using the **latest version** of vuepress-theme-plume and all plugins in this repo.
+          required: true
+
+        - label: I followed the docs and I double checked my configuration.
+          required: true
+
+  - type: input
+    id: package
+    attributes:
+      label: Package name
+      description: Which package are you reporting
+      value: vuepress-theme-plume
+      placeholder: package name
+    validations:
+      required: true
+
+  - type: checkboxes
+    id: operating-systems
+    attributes:
+      label: Which operating system are you using?
+      description: You may select more than one. Don’t select anything if it's not about the environment.
+      options:
+        - label: macOS
+        - label: Windows
+        - label: Linux
+
+  - type: markdown
+    attributes:
+      value: |
+        ## Describe the bug
+
+        > If applicable, add screenshots and log to help explain your problem.
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Describe the bug
+      description: A clear and concise description of what the bug is.
+    validations:
+      required: true
+
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Additional context
+      description: If you are not reporting something obvious, a minimal reproduction repo and related log is required.
+      placeholder: Add any other context about the problem here. Especially the issue occurs in certain OS, browser or configuration.

.github/ISSUE_TEMPLATE/bug-report.zh-CN.yml

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+name: 问题报告
+description: 创建一份问题报告以帮助我们改进
+title: '[Bug]'
+labels:
+  - bug
+assignees: pengzhanbo
+body:
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: 检查清单
+      description: |-
+        确保你遵循以下陈述。
+      options:
+        - label: 我正在使用**LTS**版本的Node.js。
+          required: true
+
+        - label: 我正在使用 **最新 v2 版本** 的 VuePress 和 VuePress 官方插件。
+          required: true
+
+        - label: 我正在使用此仓库中的 **最新版本** 的 vuepress-theme-plume 及其所有插件。
+          required: true
+
+        - label: 我按照文档操作，并仔细检查了我的配置。
+          required: true
+
+  - type: input
+    id: package
+    attributes:
+      label: 包名
+      description: 您要报告哪个包
+      value: vuepress-theme-plume
+      placeholder: package name
+    validations:
+      required: true
+
+  - type: checkboxes
+    id: operating-systems
+    attributes:
+      label: 你正在使用哪个操作系统？
+      description: 您可以选择多个选项。如果与环境无关，请不要选择任何选项。
+      options:
+        - label: macOS
+        - label: Windows
+        - label: Linux
+
+  - type: markdown
+    attributes:
+      value: |
+        ## 描述该错误
+
+        > 如有需要，请添加截图和日志以帮助解释您的问题。
+
+  - type: textarea
+    id: description
+    attributes:
+      label: 描述该错误
+      description: 一个清晰简洁的错误描述。
+    validations:
+      required: true
+
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: 附加上下文
+      description: 如果你报告的问题不明显，需要提供最小复现仓库及相关日志。
+      placeholder: 在此添加有关问题的其他上下文信息。特别是问题在特定操作系统、浏览器或配置下出现。

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Questions about theme and plugins
+    url: https://github.com/pengzhanbo/vuepress-theme-plume/discussions/new
+    about: Please ask questions in Discussion.

.github/ISSUE_TEMPLATE/feature-request.yml

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+name: Feature request
+description: Suggest an idea for this project
+title: '[Feature Request]'
+labels:
+  - enhancement
+assignees: pengzhanbo
+body:
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: Checklist
+      description: Make sure that you follow these statements.
+      options:
+        - label: I searched existing issues and no one else requests similar feature.
+          required: true
+
+        - label: I think that 25%+ users are positive towards this feature.
+          required: true
+
+  - type: textarea
+    id: feature
+    attributes:
+      label: Describe the feature
+      description: What's it for and why you want
+      placeholder: A clear and concise description of what the feature is, and what it will enhance or solve. Ex. I'm always frustrated when [...]
+    validations:
+      required: true
+
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Additional context
+      placeholder: Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/feature-request.zh-CN.yml

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+name: 新功能建议
+description: 为该项目提出一个想法
+title: '[Feature Request]'
+labels:
+  - enhancement
+assignees: pengzhanbo
+body:
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: 检查清单
+      description: 确保遵循以下陈述。
+      options:
+        - label: 我搜索了现有问题，没有其他人请求类似功能。
+          required: true
+
+        - label: 我认为25%以上的用户对此功能持积极态度。
+          required: true
+
+  - type: textarea
+    id: feature
+    attributes:
+      label: 描述该功能
+      description: 它有什么用，你为什么想要
+      placeholder: 功能清晰简洁的描述，以及它将增强或解决的问题。例如，我总是感到困难，当 [...]
+    validations:
+      required: true
+
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: 附加上下文
+      placeholder: 在此添加有关功能请求的任何其他上下文或截图。