Move Rojo server into root of the repository

src/session_id.rs

@@ -0,0 +1,11 @@
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
+pub struct SessionId(Uuid);
+
+impl SessionId {
+    pub fn new() -> SessionId {
+        SessionId(Uuid::new_v4())
+    }
+}