Write websocket server.

Cargo.toml

@@ -15,9 +15,6 @@ dotenv = "0.15.0"
 ulid = "0.3.1"
 serde = { version = "1.0", features = ["derive"] }
 rocket_contrib = "0.4.2"
-lettre = "0.9.2"
-lettre_email = "0.9.2"
-sendmail = "2.0.0"
 validator = "0.10.0"
 bcrypt = "0.6.1"
 chrono = "0.4.10"
@@ -25,3 +22,6 @@ rand = "0.7.3"
 time = "0.2.4"
 reqwest = { version = "0.10.1", features = ["blocking", "json"] }
 num_enum = "0.4.2"
+ws = "0.9.1"
+hashbrown = "0.7.0"
+serde_json = "1.0.47"