Add AnyTLS protocol

docs/configuration/outbound/anytls.md

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+### Structure
+
+```json
+{
+  "type": "anytls",
+  "tag": "anytls-out",
+
+  "server": "127.0.0.1",
+  "server_port": 1080,
+  "password": "8JCsPssfgS8tiRwiMlhARg==",
+  "idle_session_check_interval": "30s",
+  "idle_session_timeout": "30s",
+  "tls": {},
+
+  ... // Dial Fields
+}
+```
+
+### Fields
+
+#### server
+
+==Required==
+
+The server address.
+
+#### server_port
+
+==Required==
+
+The server port.
+
+#### password
+
+==Required==
+
+The AnyTLS password.
+
+#### idle_session_check_interval
+
+Interval checking for idle sessions. Default: 30s.
+
+#### idle_session_timeout
+
+In the check, close sessions that have been idle for longer than this. Default: 30s.
+
+#### tls
+
+==Required==
+
+TLS configuration, see [TLS](/configuration/shared/tls/#outbound).
+
+### Dial Fields
+
+See [Dial Fields](/configuration/shared/dial/) for details.