feat: implement saveFile method

src/models/CreatedWithIdResponse.ts

@@ -0,0 +1,15 @@
+export class CreatedWithIdResponse {
+  /**
+   * @property {number} id - The id of the created object.
+   */
+  public id: number;
+
+  /**
+   * @constructor - Creates a new instance of the CreatedWithIdResponse class.
+   * @param id - The id of the created object.
+   * @returns {CreatedWithIdResponse} - A new instance of the CreatedWithIdResponse class.
+   */
+  constructor(id: number) {
+    this.id = id;
+  }
+}