Create issue forms (theme-next#595)

* See: https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/configuring-issue-templates-for-your-repository#creating-issue-forms

.github/ISSUE_TEMPLATE/bug-report.yml

@@ -0,0 +1,97 @@
+name: Bug report
+description: Something isn't working as expected
+#title: ""
+labels: 
+  - Bug
+#assignees: ""
+body:
+  - type: markdown
+    id: overall
+    attributes:
+      value: |
+        Please follow this Issue template to provide relevant information, such as source code repository, website URL and screenshots, which will help us investigate.
+        请按照此 Issue 模版提供相关信息，例如源码仓库、网站链接和屏幕截图，这将有助于我们进行调查。
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: Issue Checklist
+      description: |
+        (我确认我已经查看了)
+      options:
+        - label: I am using NexT version 8.0 or later.
+          required: true
+        - label: I have already read the [Troubleshooting page of Hexo](https://hexo.io/docs/troubleshooting) and [Troubleshooting page of NexT](https://theme-next.js.org/docs/troubleshooting.html).
+          required: true
+        - label: I have already searched for current [issues](https://github.com/next-theme/hexo-theme-next/issues), which does not help me.
+          required: true
+  - type: textarea
+    id: expected-behavior
+    attributes:
+      label: Expected behavior
+      description: "(预期行为)"
+    validations:
+      required: true
+  - type: textarea
+    id: actual-behavior
+    attributes:
+      label: Actual behavior
+      description: |
+        (实际行为)
+        Please provide the following information (请同时提供网站链接和屏幕截图)
+      value: |
+        - Links to demo site with this issue:
+        - Links to repository or source code of the blog:
+        - Screenshots:
+    validations:
+      required: true
+  - type: textarea
+    id: reproduce
+    attributes:
+      label: Steps to reproduce the behavior
+      description: "(重现步骤)"
+    validations:
+      required: true
+  - type: markdown
+    id: env
+    attributes:
+      value: |
+        ## Environment Information
+  - type: textarea
+    id: nodejs-info
+    attributes:
+      label: Node.js and NPM Information
+      description: "Paste output from `node -v && npm -v` (粘贴 `node -v && npm -v` 输出的信息)"
+      render: Text
+    validations:
+      required: true
+  - type: textarea
+    id: dependencies
+    attributes:
+      label: Package dependencies Information
+      description: "Paste output from `npm ls --depth 0` in Hexo root directory (粘贴在 Hexo 根目录下 `npm ls --depth 0` 输出的信息)"
+      render: Text
+    validations:
+      required: true
+  - type: textarea
+    id: hexo-config
+    attributes:
+      label: Hexo Configuration
+      description: "Paste configuration from Hexo `_config.yml` (粘贴 Hexo `_config.yml` 中的内容)"
+      render: YAML
+    validations:
+      required: true
+  - type: textarea
+    id: next-config
+    attributes:
+      label: NexT Configuration
+      description: "Paste ONLY CHANGED CONFIGURATION from NexT `_config.yml` (只粘贴 NexT 主题配置文件 `_config.yml` 中修改过的部分)"
+      render: YAML
+    validations:
+      required: true
+  - type: textarea
+    id: other-info
+    attributes:
+      label: Other Information
+      description: "e.g. Browser, System"
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/feature-request.yml

@@ -0,0 +1,60 @@
+name: Feature Request
+description: Suggest an idea for this project
+#title: ""
+labels: 
+  - Feature Request
+#assignees: ""
+body:
+  - type: markdown
+    id: overall
+    attributes:
+      value: |
+        Please follow this Issue template to provide relevant information, such as source code repository, website URL and screenshots, which will help us investigate.
+        请按照此 Issue 模版提供相关信息，例如源码仓库、网站链接和屏幕截图，这将有助于我们进行调查。
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: Issue Checklist
+      description: |
+        (我确认我已经查看了)
+      options:
+        - label: I am using NexT version 8.0 or later.
+          required: true
+        - label: I have already read the [Troubleshooting page of Hexo](https://hexo.io/docs/troubleshooting) and [Troubleshooting page of NexT](https://theme-next.js.org/docs/troubleshooting.html).
+          required: true
+        - label: I have already searched for current [issues](https://github.com/next-theme/hexo-theme-next/issues), which does not help me.
+          required: true
+  - type: textarea
+    id: expected-behavior
+    attributes:
+      label: Expected behavior
+      description: "(预期行为)"
+    validations:
+      required: true
+  - type: textarea
+    id: actual-behavior
+    attributes:
+      label: Actual behavior
+      description: |
+        (实际行为)
+        Please provide the following information (请同时提供网站链接和屏幕截图)
+      value: |
+        - Links to demo site with this issue:
+        - Links to repository or source code of the blog:
+        - Screenshots:
+    validations:
+      required: true
+  - type: textarea
+    id: reproduce
+    attributes:
+      label: Steps to reproduce the behavior
+      description: "(重现步骤)"
+    validations:
+      required: true
+  - type: textarea
+    id: other-info
+    attributes:
+      label: Other Information
+      description: "e.g. Browser, System"
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/other.yml

@@ -0,0 +1,33 @@
+name: Other
+description: Not a feature request or bug report
+#title: ""
+labels: 
+  - Question
+#assignees: ""
+body:
+  - type: markdown
+    id: overall
+    attributes:
+      value: |
+        Please follow this Issue template to provide relevant information, such as source code repository, website URL and screenshots, which will help us investigate.
+        请按照此 Issue 模版提供相关信息，例如源码仓库、网站链接和屏幕截图，这将有助于我们进行调查。
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: Issue Checklist
+      description: |
+        (我确认我已经查看了)
+      options:
+        - label: I am using NexT version 8.0 or later.
+          required: true
+        - label: I have already read the [Troubleshooting page of Hexo](https://hexo.io/docs/troubleshooting) and [Troubleshooting page of NexT](https://theme-next.js.org/docs/troubleshooting.html).
+          required: true
+        - label: I have already searched for current [issues](https://github.com/next-theme/hexo-theme-next/issues), which does not help me.
+          required: true
+  - type: textarea
+    id: other-info
+    attributes:
+      label: Other Information
+      description: "e.g. Browser, System"
+    validations:
+      required: true