Add the "frp" note.

Author: paveloom

content/notes/frp.md

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+title = "frp"
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+
+*frp* is a fast reverse proxy that allows you to expose a local server located behind a NAT or firewall to the Internet. It currently supports TCP and UDP, as well as HTTP and HTTPS protocols, enabling requests to be forwarded to internal services via domain name.
+
+Links:
+
+- [Source code](https://github.com/fatedier/frp)
+
+## Example
+
+The following is an example of making a WebDAV server hosted on the client's hardware in a home network with dynamic IP available to the world through HTTP via an *frp* proxy running on the server.
+
+One can also add a TLS termination proxy in the mix to secure the connection.
+
+Server configuration:
+
+```toml
+# /etc/frp/frps.toml
+
+bindAddr = "0.0.0.0"
+bindPort = 7000
+vhostHTTPPort = 80
+auth.token = "TOKEN"
+subDomainHost = "frp.example.com"
+```
+
+Client configuration:
+
+```toml
+# /etc/frp/frpc.toml
+
+user = "laptop"
+serverAddr = "frp.example.com"
+serverPort = 7000
+loginFailExit = false
+
+auth.method = "token"
+auth.token = "TOKEN"
+
+[[proxies]]
+name = "webdav"
+type = "http"
+localPort = 4918
+subdomain = "webdav"
+```