免费SSL申请
https://letsencrypt.org/docs/client-options/
- ACMESharp (.NET, PowerShell)
- win-acme (.NET)
- Certify The Web GUI (.NET, WPF)
- oocx/acme.net (.NET)
- kelunik/acme-client (PHP)
- ZeroSSL Windows
- AutoACME (.NET)
- Posh-ACME (PowerShell)
- Certes (.NET)
选择ACMESharp
powershell 下的具体操作方式参考：
1.https://github.com/ebekker/ACMESharp/wiki/Quick-Start
2.https://pkisharp.github.io/ACMESharp-docs/Quick-Start
