FEATURE: warning message when world is near full capacity

front/src/Connexion/WorldFullWarningStream.ts

@@ -0,0 +1,14 @@
+import {Subject} from "rxjs";
+
+class WorldFullWarningStream {
+
+    private _stream:Subject<void> = new Subject();
+    public stream = this._stream.asObservable();
+
+
+    onMessage() {
+        this._stream.next();
+    }
+}
+
+export const worldFullWarningStream = new WorldFullWarningStream();