documentation: Add hysteria2

docs/configuration/inbound/hysteria2.md

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+### Structure
+
+```json
+{
+  "type": "hysteria2",
+  "tag": "hy2-in",
+  
+  ... // Listen Fields
+
+  "up_mbps": 100,
+  "down_mbps": 100,
+  "obfs": {
+    "type": "salamander",
+    "password": "cry_me_a_r1ver"
+  },
+  "users": [
+    {
+      "name": "tobyxdd",
+      "password": "goofy_ahh_password"
+    }
+  ],
+  "ignore_client_bandwidth": false,
+  "masquerade": "",
+  "tls": {}
+}
+```
+
+!!! warning ""
+
+    QUIC, which is required by Hysteria2 is not included by default, see [Installation](/#installation).
+
+### Listen Fields
+
+See [Listen Fields](/configuration/shared/listen) for details.
+
+### Fields
+
+#### up_mbps, down_mbps
+
+Max bandwidth, in Mbps.
+
+Not limited if empty.
+
+Conflict with `ignore_client_bandwidth`.
+
+#### obfs.type
+
+QUIC traffic obfuscator type, only available with `salamander`.
+
+Disabled if empty.
+
+#### obfs.password
+
+QUIC traffic obfuscator password.
+
+#### users
+
+Hysteria2 users
+
+#### users.password
+
+Authentication password
+
+#### ignore_client_bandwidth
+
+Commands the client to use the BBR flow control algorithm instead of Hysteria CC.
+
+Conflict with `up_mbps` and `down_mbps`.
+
+#### masquerade
+
+HTTP3 server behavior when authentication fails.
+
+| Scheme       | Example                 | Description        |
+|--------------|-------------------------|--------------------|
+| `file`       | `file:///var/www`       | As a file server   |
+| `http/https` | `http://127.0.0.1:8080` | As a reverse proxy |
+
+A 404 page will be returned if empty.
+
+#### tls
+
+==Required==
+
+TLS configuration, see [TLS](/configuration/shared/tls/#inbound).