chore: add room id value object

src/env/entity/room/RoomID.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2023. Smart Operating Block
+ *
+ * Use of this source code is governed by an MIT-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/MIT.
+ */
+
+package entity.room;
+
+/**
+ * Room identifier.
+ */
+public class RoomID {
+    private final String id;
+
+    /**
+     * Default constructor.
+     * @param id the id.
+     */
+    public RoomID(final String id) {
+        this.id = id;
+    }
+
+    /**
+     * Get the id.
+     * @return the id.
+     */
+    public String getId() {
+        return this.id;
+    }
+}