documentation: Add hysteria2

docs/configuration/outbound/hysteria2.md

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+### Structure
+
+```json
+{
+  "type": "hysteria2",
+  "tag": "hy2-out",
+  
+  "server": "127.0.0.1",
+  "server_port": 1080,
+  "up_mbps": 100,
+  "down_mbps": 100,
+  "obfs": {
+    "type": "salamander",
+    "password": "cry_me_a_r1ver"
+  },
+  "password": "goofy_ahh_password",
+  "network": "tcp",
+  "tls": {},
+  
+  ... // Dial Fields
+}
+```
+
+!!! warning ""
+
+    QUIC, which is required by Hysteria2 is not included by default, see [Installation](/#installation).
+
+### Fields
+
+#### server
+
+==Required==
+
+The server address.
+
+#### server_port
+
+==Required==
+
+The server port.
+
+#### up_mbps, down_mbps
+
+Max bandwidth, in Mbps.
+
+If empty, the BBR congestion control algorithm will be used instead of Hysteria CC.
+
+#### obfs.type
+
+QUIC traffic obfuscator type, only available with `salamander`.
+
+Disabled if empty.
+
+#### obfs.password
+
+QUIC traffic obfuscator password.
+
+#### password
+
+Authentication password.
+
+#### 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.