(add) github issue template

.github/ISSUE_TEMPLATE/01_visitor-bug-report-ja.yml

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+name: 🐛 【閲覧者】バグ報告 (Japanese)
+description: サイトの誤作動があった場合はこちらにご報告ください。
+labels: ["bug?", "maybe non-developer"]
+
+body:
+  - type: markdown
+    attributes:
+      value: |
+        ご報告ありがとうございます！実際に問題を報告する前に、以下をお試しください：
+ 
+        - **ブラウザのキャッシュ・Cookieを削除**してみましたか？
+        - **時間を開けて再度アクセス**してみましたか？
+        - **URLが正しいか**お確かめになりましたか？
+
+        また、以下のことにもご注意ください。
+
+        - **このフォームはバグ報告専用です。**機能リクエストは[こちら](https://github.com/misskey-dev/misskey-hub-next/issues/new?assignees=&labels=feature&projects=&template=04_feature-request.yml)からお願いします。
+
+        以上のことを試してもまだ問題が解決しない場合は、以下に症状をできるだけ詳しく記入してください。**貴重なお時間を使ってご報告いただきありがとうございます！**
+
+  - type: textarea
+    attributes:
+      label: 💡 概要
+      description: どのような問題が起こっているかを簡潔にお書きください。
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: 🥰 期待されるふるまい
+      description: 本当はどういうことがしたかったのかをお書きください。
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: 🤬 実際のふるまい
+      description: |
+        実際には何が起きたのかをお書きください。
+        可能であれば、スクリーンショットやエラーログなども添付いただけますと幸いです。
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: 📝 再現方法
+      description: その問題が起こるまでにどのような操作をしたかを、手順別に詳細にお書きください。
+      placeholder: |
+        1.
+        2.
+        3.
+    validations:
+      required: false
+
+  - id: environment
+    type: textarea
+    attributes:
+      label: 💻 動作環境
+      description: |
+        この問題が起きた環境をお教えください（既に埋まっている場合は記入不要です）。
+
+        例:
+          * Model and OS of the device(s): MacBook Pro (14inch, 2021), macOS Ventura 13.4
+          * Browser: Chrome 113.0.5672.126
+      value: |
+        * Model and OS of the device(s):
+        * Browser:
+      render: markdown
+    validations:
+      required: false
+
+  - type: checkboxes
+    attributes:
+    label: 【開発者向け】自分でこのバグに対処しますか？
+    description: これが何かわからない場合は、チェックボックスを開けたままにして、そのままフォームを送信してください。
+    options:
+      - label: はい、私はこのバグに自分で対処して、このリポジトリにPull Requestを送信する予定です。

.github/ISSUE_TEMPLATE/02_visitor-bug-report-en.yml

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+name: 🐛 [For visitors] Bug Report (English)
+description: If you encounter any malfunction on the site, please report it here.
+labels: ["bug?", "maybe non-developer"]
+
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for your report! Before reporting an issue, please try the following:
+ 
+        - Have you tried **clearing your browser cache and cookies**?
+        - Have you **waited for some time and tried accessing again**?
+        - Have you confirmed that the **URL is correct**?
+
+        Please also note the following:
+
+        - **This form is for bug reports only**. For feature requests, please [click here](https://github.com/misskey-dev/misskey-hub-next/issues/new?assignees=&labels=feature&projects=&template=04_feature-request.yml).
+
+        If the issue persists after trying the above, please provide details of the symptoms below. **Thank you for taking the time to report the issue!**
+
+  - type: textarea
+    attributes:
+      label: 💡 Summary
+      description: Please briefly describe the issue.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: 🥰 Expected Behavior
+      description: Please describe what you expected to happen.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: 🤬 Actual Behavior
+      description: |
+        Please describe what actually happened.
+        If possible, attaching screenshots or error logs would be appreciated.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: 📝 Steps to Reproduce
+      description: Please provide detailed steps on how to reproduce the issue.
+      placeholder: |
+        1.
+        2.
+        3.
+    validations:
+      required: false
+
+  - id: environment
+    type: textarea
+    attributes:
+      label: 💻 Environment
+      description: |
+        Please provide information about the environment where the issue occurred (fill in if not already provided).
+
+        Example:
+          * Model and OS of the device(s): MacBook Pro (14inch, 2021), macOS Ventura 13.4
+          * Browser: Chrome 113.0.5672.126
+      value: |
+        * Model and OS of the device(s):
+        * Browser:
+      render: markdown
+    validations:
+      required: false
+
+  - type: checkboxes
+    attributes:
+    label: (For developer) Do you want to address this bug yourself?
+    description: If you do not know what this is, please leave the checkbox open and submit the form as is.
+    options:
+      - label: Yes, I will patch the bug myself and send a pull request

.github/ISSUE_TEMPLATE/03_developer-bug-report.yml

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+name: 🐛 [For developers] Bug Report
+description: Create a report to help us improve
+labels: ["bug?"]
+
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for your report! 
+        First, in order to avoid duplicate Issues, please search to see if the problem you found has already been reported.
+
+  - type: textarea
+    attributes:
+      label: 💡 Summary
+      description: Tell us what the bug is
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: 🥰 Expected Behavior
+      description: Tell us what should happen
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: 🤬 Actual Behavior
+      description: |
+        Tell us what happens instead of the expected behavior.
+        Please include errors from the developer console and/or server log files if you have access to them.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: 📝 Steps to Reproduce
+      placeholder: |
+        1.
+        2.
+        3.
+    validations:
+      required: false
+
+  - type: textarea
+    attributes:
+      label: 💻 Environment
+      description: |
+        Please provide information about the environment where the issue occurred.
+        You can use `npx nuxi info` to fill this section.
+
+        Example:
+          * Model and OS of the device(s): MacBook Pro (14inch, 2021), macOS Ventura 13.4
+          * Browser: Chrome 113.0.5672.126
+      value: |
+        * Model and OS of the device(s):
+        * Browser:
+      render: markdown
+    validations:
+      required: false
+
+  - type: checkboxes
+    attributes:
+    label: Do you want to address this bug yourself?
+    options:
+      - label: Yes, I will patch the bug myself and send a pull request

.github/ISSUE_TEMPLATE/04_feature-request.yml

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+name: ✨ Feature Request
+description: Suggest an idea for this project
+labels: ["feature"]
+
+body:
+  - type: textarea
+    attributes:
+      label: Summary
+      description: Tell us what the suggestion is
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Purpose
+      description: Describe the specific problem or need you think this feature will solve, and who it will help.
+    validations:
+      required: true
+  - type: checkboxes
+    attributes:
+    label: Do you want to implement this feature yourself?
+    options:
+      - label: Yes, I will implement this by myself and send a pull request

.github/ISSUE_TEMPLATE/config.yml

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+contact_links:
+  - name: 💬 Bug reports and feature requests for Misskey itself
+    url: https://github.com/misskey-dev/misskey/issues
+    about: Misskey本体に関するバグ報告・機能リクエストはこちらから