Add shadowtls (#49)

* Add shadowtls outbound

* Add shadowtls inbound

* Add shadowtls example

* Add shadowtls documentation

docs/examples/shadowtls.md

@@ -0,0 +1,55 @@
+#### Server
+
+```json
+{
+  "inbounds": [
+    {
+      "type": "shadowtls",
+      "listen": "::",
+      "listen_port": 4443,
+      "handshake": {
+        "server": "google.com",
+        "server_port": 443
+      },
+      "detour": "shadowsocks-in"
+    },
+    {
+      "type": "shadowsocks",
+      "tag": "shadowsocks-in",
+      "listen": "127.0.0.1",
+      "method": "2022-blake3-aes-128-gcm",
+      "password": "8JCsPssfgS8tiRwiMlhARg=="
+    }
+  ]
+}
+```
+
+#### Client
+
+```json
+{
+  "outbounds": [
+    {
+      "type": "shadowsocks",
+      "method": "2022-blake3-aes-128-gcm",
+      "password": "8JCsPssfgS8tiRwiMlhARg==",
+      "detour": "shadowtls-out",
+      "multiplex": {
+        "enabled": 1,
+        "max_connections": 4,
+        "min_streams": 4
+      }
+    },
+    {
+      "type": "shadowtls",
+      "tag": "shadowtls-out",
+      "server": "127.0.0.1",
+      "server_port": 4443,
+      "tls": {
+        "enabled": true,
+        "server_name": "google.com"
+      }
+    }
+  ]
+}
+```