Add issue templates

.github/ISSUE_TEMPLATE/00-bug-report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Checklist**
+
+- [ ] I read the [README](https://github.com/hwdsl2/setup-ipsec-vpn/blob/master/README.md)
+- [ ] I read the [Important notes](https://github.com/hwdsl2/setup-ipsec-vpn/blob/master/README.md#important-notes)
+- [ ] I followed instructions to [configure VPN clients](https://github.com/hwdsl2/setup-ipsec-vpn/blob/master/README.md#next-steps)
+- [ ] I checked [Troubleshooting](https://github.com/hwdsl2/setup-ipsec-vpn/blob/master/docs/clients.md#troubleshooting) and [VPN status](https://github.com/hwdsl2/setup-ipsec-vpn/blob/master/docs/clients.md#check-logs-and-vpn-status)
+- [ ] I searched existing [Issues](https://github.com/hwdsl2/setup-ipsec-vpn/issues?q=is%3Aissue)
+- [ ] This bug is about the VPN setup scripts, and not IPsec VPN itself
+
+<!---
+If you need help with IPsec VPN itself, please use the [Libreswan](https://lists.libreswan.org/mailman/listinfo/swan) or [strongSwan](https://lists.strongswan.org/mailman/listinfo/users) mailing list, or search e.g. [Stack Overflow](https://stackoverflow.com/questions/tagged/vpn).
+--->
+
+**Describe the issue**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+
+1. ...
+2. ...
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Logs**
+[Check logs and VPN status](https://github.com/hwdsl2/setup-ipsec-vpn/blob/master/docs/clients.md#check-logs-and-vpn-status), and add error logs to help explain the problem, if applicable.
+
+**Server (please complete the following information)**
+- OS: [e.g. Debian 10]
+- Hosting provider (if applicable): [e.g. GCP, AWS]
+
+**Client (please complete the following information)**
+- Device: [e.g. iPhone 8]
+- OS: [e.g. iOS 13.6]
+- VPN mode: [IPsec/L2TP, IPsec/XAuth ("Cisco IPsec") or IKEv2]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/10-bug-report-zh.md

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+---
+name: 错误报告
+about: 请使用这个模板来提交 bug
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**任务列表**
+
+- [ ] 我已阅读 [自述文件](https://github.com/hwdsl2/setup-ipsec-vpn/blob/master/README-zh.md)
+- [ ] 我已阅读 [重要提示](https://github.com/hwdsl2/setup-ipsec-vpn/blob/master/README-zh.md#重要提示)
+- [ ] 我已按照说明 [配置 VPN 客户端](https://github.com/hwdsl2/setup-ipsec-vpn/blob/master/README-zh.md#下一步)
+- [ ] 我检查了 [故障排除](https://github.com/hwdsl2/setup-ipsec-vpn/blob/master/docs/clients-zh.md#故障排除) 以及 [VPN 状态](https://github.com/hwdsl2/setup-ipsec-vpn/blob/master/docs/clients-zh.md#检查日志及-vpn-状态)
+- [ ] 我搜索了已有的 [Issues](https://github.com/hwdsl2/setup-ipsec-vpn/issues?q=is%3Aissue)
+- [ ] 这个 bug 是关于 VPN 安装脚本，而不是 IPsec VPN 本身
+
+<!---
+如果你需要关于 IPsec VPN 本身的帮助，请使用 [Libreswan](https://lists.libreswan.org/mailman/listinfo/swan) 或 [strongSwan](https://lists.strongswan.org/mailman/listinfo/users) 用户列表，或者搜索比如 [Stack Overflow](https://stackoverflow.com/questions/tagged/vpn)。
+--->
+
+**问题描述**
+使用清楚简明的语言描述这个 bug。
+
+**重现步骤**
+重现该 bug 的步骤：
+
+1. ...
+2. ...
+
+**期待的正确结果**
+简要地描述你期望的正确结果。
+
+**日志**
+[检查日志及 VPN 状态](https://github.com/hwdsl2/setup-ipsec-vpn/blob/master/docs/clients-zh.md#检查日志及-vpn-状态)，并添加错误日志以帮助解释该问题（如果适用）。
+
+**服务器信息（请填写以下信息）**
+- 操作系统: [比如 Debian 10]
+- 服务提供商（如果适用）: [比如 GCP, AWS]
+
+**客户端信息（请填写以下信息）**
+- 设备: [比如 iPhone 8]
+- 操作系统: [比如 iOS 13.6]
+- VPN 模式: [IPsec/L2TP, IPsec/XAuth ("Cisco IPsec") 或 IKEv2]
+
+**其它信息**
+添加关于该 bug 的其它信息。