Add v2ray QUIC transport

constant/quic_stub.go

@@ -2,4 +2,8 @@
 
 package constant
 
+import E "github.com/sagernet/sing/common/exceptions"
+
 const QUIC_AVAILABLE = false
+
+var ErrQUICNotIncluded = E.New(`QUIC is not included in this build, rebuild with -tags with_quic`)

constant/v2ray.go

@@ -3,4 +3,5 @@ package constant
 const (
 	V2RayTransportTypeGRPC      = "grpc"
 	V2RayTransportTypeWebsocket = "ws"
+	V2RayTransportTypeQUIC      = "quic"
 )