documentation: Add TUIC

docs/configuration/outbound/tuic.md

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+### Structure
+
+```json
+{
+  "type": "tuic",
+  "tag": "tuic-out",
+  
+  "server": "127.0.0.1",
+  "server_port": 1080,
+  "uuid": "2DD61D93-75D8-4DA4-AC0E-6AECE7EAC365",
+  "password": "hello",
+  "congestion_control": "cubic",
+  "udp_relay_mode": "native",
+  "zero_rtt_handshake": false,
+  "heartbeat": "10s",
+  "network": "tcp",
+  "tls": {},
+  
+  ... // Dial Fields
+}
+```
+
+!!! warning ""
+
+    QUIC, which is required by TUIC is not included by default, see [Installation](/#installation).
+
+### Fields
+
+#### server
+
+==Required==
+
+The server address.
+
+#### server_port
+
+==Required==
+
+The server port.
+
+#### uuid
+
+==Required==
+
+TUIC user uuid
+
+#### password
+
+TUIC user password
+
+#### congestion_control
+
+QUIC congestion control algorithm
+
+One of: `cubic`, `new_reno`, `bbr`
+
+`cubic` is used by default.
+
+#### udp_relay_mode
+
+UDP packet relay mode
+
+| Mode   | Description                                                              |
+|:-------|:-------------------------------------------------------------------------|
+| native | native UDP characteristics                                               |
+| quic   | lossless UDP relay using QUIC streams, additional overhead is introduced |
+
+`native` is used by default.
+
+#### network
+
+Enabled network
+
+One of `tcp` `udp`.
+
+Both is enabled by default.
+
+#### tls
+
+==Required==
+
+TLS configuration, see [TLS](/configuration/shared/tls/#outbound).
+
+### Dial Fields
+
+See [Dial Fields](/configuration/shared/dial) for details.