Edit App and README, add Prime game

Author: Antojkv

README.md

@@ -13,3 +13,5 @@
 "GCD" https://asciinema.org/a/anWD6GPnBTcWTBLCfvbMGZeV6
 
 "Progression" https://asciinema.org/a/4cwJUcnV4TcEFSpdqMrIa3xjf
+
+"Prime" https://asciinema.org/a/KIxIZnfYvYP0D6PokMo9QKryI

app/src/main/java/hexlet/code/App.java

@@ -4,6 +4,7 @@
 import hexlet.code.games.Even;
 import hexlet.code.games.Gcd;
 import hexlet.code.games.Progression;
+import hexlet.code.games.Prime;
 import java.util.Scanner;
 
 class App {
@@ -14,6 +15,7 @@ public static void main(String[] args) {
         System.out.println("3 - Calculator");
         System.out.println("4 - GCD");
         System.out.println("5 - Progression");
+        System.out.println("6 - Prime");
         System.out.println("0 - Exit");
 
         Scanner scanner = new Scanner(System.in);
@@ -36,6 +38,9 @@ public static void main(String[] args) {
             case "5":
                 Progression.startGame();
                 break;
+            case "6":
+                Prime.startGame();
+                break;
             case "0":
                 System.out.println("Goodbye!");
                 break;

app/src/main/java/hexlet/code/games/Prime.java

@@ -0,0 +1,34 @@
+package hexlet.code.games;
+
+import hexlet.code.Engine;
+import java.security.SecureRandom;
+
+public class Prime {
+    public static boolean isPrime(int number) {
+        if (number < 2) {
+            return false;
+        }
+        for (int i = 2; i < number; i++) {
+            if (number % i == 0) {
+                return false;
+            }
+        }
+        return  true;
+    }
+
+    public static void startGame() {
+        String description = "Answer 'yes' if given number is prime. Otherwise answer 'no'.";
+        String[][] data = new String[Engine.getRoundsCount()][2];
+        SecureRandom random = new SecureRandom();
+
+        for (int i = 0; i < Engine.getRoundsCount(); i++) {
+            int number = random.nextInt(99) + 1;
+            String question = String.valueOf(number);
+            String correctAnswer = isPrime(number) ? "yes" : "no";
+
+            data[i][0] = question;
+            data[i][1] = correctAnswer;
+        }
+        Engine.run(description, data);
+    }
+}