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Menu.cs

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+class Menu
+{
+    public Menu()
+    {
+        OnePlayer menu1 = new OnePlayer();
+        TwoPlayer menu2 = new TwoPlayer();
+        Console.Write("ROCK, PAPER, SCISSORS\nChoose Game Mode:\tSingle Player (1), 2-Player (2)");
+        Console.Write("\nType and Enter: ");
+        int a = int.Parse(Console.ReadLine());
+        if(a == 1){
+            menu1.Play();
+        }else if(a == 2){
+            menu2.Play();
+        }else{
+            Console.Write("Invalid input!");
+        }
+    }
+}