Add IsEven Algorithm (#4301)

Co-authored-by: BamaCharanChhandogi <b.c.chhandogi@gmailcom>

src/test/java/com/thealgorithms/bitmanipulation/IsEvenTest.java

@@ -0,0 +1,14 @@
+package com.thealgorithms.bitmanipulation;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+class IsEvenTest {
+    @Test
+    void testIsEven() {
+        assertEquals(true, IsEven.isEven(2));
+        assertEquals(true, IsEven.isEven(-12));
+        assertEquals(false, IsEven.isEven(21));
+    }
+}