feat: ✨ rtc peer connection send_offer, receive_offer

protocol/src/lib.rs

@@ -6,3 +6,14 @@ pub struct Signal {
     pub username: String,
     pub time: DateTime<Utc>,
 }
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct RTCSessionOffer {
+    pub username: String,
+    pub rtc_session_offer: String,
+}
+#[derive(Debug, Serialize, Deserialize)]
+pub struct RTCSessionAnswer {
+    pub username: String,
+    pub rtc_session_offer: String,
+}