feat: ✨ rtc peer connection offer

protocol/src/lib.rs

@@ -0,0 +1,8 @@
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Signal {
+    pub username: String,
+    pub time: DateTime<Utc>,
+}