feat: asking user if he wants to restore a game

src/main/java/hepia/App.java

 package hepia;
 
+import java.io.IOException;
 import java.util.Scanner;
 
 /**
  * App
  */
 public class App {
+    private static final Scanner scanner = new Scanner(System.in);
+
+    public static boolean askUserToLoadGame() {
+        String input;
+        boolean inputCorrect = false;
+        do {
+            System.out.println();
+            System.out.println("Would you like to load an existing game ? [y/n] ");
+
+            input = scanner.next();
+
+            switch (input) {
+                case "y":
+                    return true;
+                case "n":
+                    return false;
+                default:
+                    break;
+            }
+        } while (!inputCorrect);
 
-    public static void main(String[] args) {
-        Scanner scanner = new java.util.Scanner(System.in);
+        return false;
+    }
 
+    public static void main(String[] args) throws IOException{
+        if (askUserToLoadGame()) {
+            System.out.print("Please specify the path to the `.ser` file: ");
+            String filePath = scanner.next();
+            try {
+                GameManager.restoreGame(filePath);
+            } catch (Exception e) {
+                System.err.println("Game couldn't be restored");
+                System.exit(1);
+            }
+        } else {
             System.out.print("How many decks of cards would like to create: ");
             int nbDecks = scanner.nextInt();
             System.out.print("Please specify the amount of human players: ");
@@ -24,7 +56,6 @@ public class App {
             foo.initBets(nbHumanPlayers, nbBasicAi, nbAdvancedAi);
 
             foo.runGame();
-
-        scanner.close();
+        }
     }
 }