contrib/tlstunnel: new document

contrib/tlstunnel.md

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+# Setting up tlstunnel with soju
+
+[tlstunnel] can be used in front of soju to take care of TLS.
+
+## tlstunnel configuration
+
+```
+frontend {
+	listen irc.example.org:6697
+	backend tcp+proxy://localhost:6667
+	protocol irc
+}
+```
+
+## soju configuration
+
+```
+listen irc+insecure://localhost
+accept-proxy-ip localhost
+```
+
+[tlstunnel]: https://git.sr.ht/~emersion/tlstunnel