Add Josephus Problem Recursive Solution (#3208)

src/test/java/com/thealgorithms/maths/JosephusProblemTest.java

@@ -0,0 +1,15 @@
+package com.thealgorithms.maths;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class JosephusProblemTest {
+
+    @Test
+    void testJosephusProblem(){
+        assertEquals(3, JosephusProblem.findTheWinner(5,2));
+        assertEquals(5, JosephusProblem.findTheWinner(6,4));
+    }
+
+}