chore: create room repository interface

Author: AndreaGiulianelli

Diff for: src/main/kotlin/usecase/repository/RoomRepository.kt

@@ -0,0 +1,35 @@
+/*
+ * 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 usecase.repository
+
+import entity.zone.Room
+import entity.zone.RoomID
+
+/**
+ * Interface that models the repository to manage Rooms.
+ */
+interface RoomRepository {
+    /**
+     * Create a [room].
+     * @return null if the room already exists, the room created otherwise.
+     */
+    fun createRoom(room: Room): Room?
+
+    /**
+     * Delete a room by its [roomId].
+     * @return true if correctly deleted, false otherwise.
+     */
+    fun deleteRoom(roomId: RoomID): Boolean
+
+    /**
+     * Find a room by its [roomId].
+     * @return the room if present, null otherwise.
+     */
+    fun findBy(roomId: RoomID): Room?
+}