Chore: add issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: "[Bug]"
+labels: ''
+assignees: ''
+
+---
+
+<!-- The English version is available. -->
+感谢你向 Clash Core 提交 issue！
+在提交之前，请确认：
+
+- [ ] 我已经在 [Issue Tracker](……/) 中找过我要提出的问题
+- [ ] 这是 Clash 核心的问题，并非我所使用的 Clash 衍生版本（如 Openclash、Koolclash 等）的特定问题
+- [ ] 我已经使用 Clash core 的 dev 分支版本测试过，问题依旧存在
+- [ ] 如果你可以自己 debug 并解决的话，提交 PR 吧！
+
+请注意，如果你并没有遵照这个 issue template 填写内容，我们将直接关闭这个 issue。
+
+<!--
+Thanks for submitting an issue towards the Clash core!
+But before so, please do the following checklist:
+
+- [ ] Is this something you can **debug and fix**? Send a pull request! Bug fixes and documentation fixes are welcome.
+- [ ] Your issue may already be reported! Please search on the [issue tracker](……/) before creating one.
+- [ ] I have tested using the dev branch, and the issue still exists.
+- [ ] This is an issue related to the Clash core, not to the derivatives of Clash, like Openclash or Koolclash
+
+Please understand that we close issues that fail to follow the issue template.
+-->
+
+我都确认过了，我要继续提交。
+<!-- None of the above, create a bug report -->
+------------------------------------------------------------------
+
+请附上任何可以帮助我们解决这个问题的信息，如果我们收到的信息不足，我们将对这个 issue 加上 *Needs more information* 标记并在收到更多资讯之前关闭 issue。
+<!-- Make sure to add **all the information needed to understand the bug** so that someone can help. If the info is missing we'll add the 'Needs more information' label and close the issue until there is enough information. -->
+
+### clash core config
+<!--
+在下方附上 Clash core 脱敏后配置文件的内容
+Paste the Clash core configuration below.
+-->
+```
+……
+```
+
+### Clash log
+<!--
+在下方附上 Clash Core 的日志，log level 最好使用 DEBUG
+Paste the Clash core log below with the log level set to `DEBUG`.
+-->
+```
+……
+```
+
+### 环境 Environment
+
+* Clash Core 的操作系统 (the OS that the Clash core is running on)
+……
+* 使用者的操作系统 (the OS running on the client)
+……
+* 网路环境或拓扑 (network conditions/topology)
+……
+* iptables，如果适用 (if applicable)
+……
+* ISP 有没有进行 DNS 污染 (is your ISP performing DNS pollution?)
+……
+* 其他
+……
+
+### 说明 Description
+
+<!--
+请详细、清晰地表达你要提出的论述，例如这个问题如何影响到你？你想实现什么功能？
+-->
+
+### 重现问题的具体布骤 Steps to Reproduce
+
+1. [First Step]
+2. [Second Step]
+3. ……
+
+**我预期会发生……？**
+<!-- **Expected behavior:** [What you expected to happen] -->
+
+**实际上发生了什麽？**
+<!-- **Actual behavior:** [What actually happened] -->
+
+### 可能的解决方案 Possible Solution
+<!-- 此项非必须，但是如果你有想法的话欢迎提出。 -->
+<!-- Not obligatory, but suggest a fix/reason for the bug, -->
+<!-- or ideas how to implement the addition or change -->
+
+### 更多信息 More Information

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: "[Feature]"
+labels: ''
+assignees: ''
+
+---
+
+<!-- The English version is available. -->
+感谢你向 Clash Core 提交 Feature Request！
+在提交之前，请确认：
+
+- [ ] 我已经在 [Issue Tracker](……/) 中找过我要提出的请求
+
+请注意，如果你并没有遵照这个 issue template 填写内容，我们将直接关闭这个 issue。
+
+<!--
+Thanks for submitting a feature request towards the Clash core!
+But before so, please do the following checklist:
+
+- [ ] I have searched on the [issue tracker](……/) before creating the issue.
+
+Please understand that we close issues that fail to follow the issue template.
+-->
+
+我都确认过了，我要继续提交。
+<!-- None of the above, create a feature request -->
+------------------------------------------------------------------
+
+请附上任何可以帮助我们解决这个问题的信息，如果我们收到的信息不足，我们将对这个 issue 加上 *Needs more information* 标记并在收到更多资讯之前关闭 issue。
+<!-- Make sure to add **all the information needed to understand the bug** so that someone can help. If the info is missing we'll add the 'Needs more information' label and close the issue until there is enough information. -->
+
+### Clash core config
+<!--
+在下方附上 Clash Core 脱敏后的配置内容
+Paste the Clash core configuration below.
+-->
+```
+……
+```
+
+### Clash log
+<!--
+在下方附上 Clash Core 的日志，log level 请使用 DEBUG
+Paste the Clash core log below with the log level set to `DEBUG`.
+-->
+```
+……
+```
+
+### 环境 Environment
+
+* Clash Core 的操作系统 (the OS that the Clash core is running on)
+……
+* 使用者的操作系统 (the OS running on the client)
+……
+* 网路环境或拓扑 (network conditions/topology)
+……
+* iptables，如果适用 (if applicable)
+……
+* ISP 有没有进行 DNS 污染 (is your ISP performing DNS pollution?)
+……
+* 其他
+……
+
+### 说明 Description
+
+<!--
+请详细、清晰地表达你要提出的论述，例如这个问题如何影响到你？你想实现什么功能？目前 Clash Core 的行为是什麽？
+-->
+
+### 可能的解决方案 Possible Solution
+<!-- 此项非必须，但是如果你有想法的话欢迎提出。 -->
+<!-- Not obligatory, but suggest a fix/reason for the bug, -->
+<!-- or ideas how to implement the addition or change -->
+
+### 更多信息 More Information