Add dependencies

Cargo.toml

@@ -13,3 +13,5 @@ url = "2.3.1"
 chrono = "0.4.24"
 regex = "1.7.3"
 custom_error = "1.9.2"
+native-tls = "0.2.11"
+tokio-tungstenite = {version = "0.18.0", features = ["native-tls"]}

src/gateway.rs

@@ -1,2 +1,4 @@
 #[derive(Debug)]
-pub struct Gateway {}
+pub struct Gateway {
+    url: String,
+}