[App] App target setup (#1)

This PR contains the work done to set the `App` target for the **Reviews** project.

Reviewed-on: rock-n-code/app-reviews#1
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

App/Sources/Review.swift

@@ -0,0 +1,26 @@
+//
+//  AppDelegate.swift
+//  AppStoreReviews
+//
+//  Created by Dmitrii Ivanov on 21/07/2020.
+//  Copyright © 2020 ING. All rights reserved.
+//
+
+import Foundation
+
+struct Review {
+    let author: String
+    let version: String
+    let rating: Int
+    let title: String
+    let id: String
+    let content: String
+    
+    func ratingVersionText() -> String {
+        var stars = ""
+        for _ in 0..<rating {
+            stars += "⭐️"
+        }
+        return "\(stars) (ver: \(version))"
+    }
+}