feat: Add Bitwise4 class demonstrating left shift operation

Add a program that:
- Initializes an integer using a binary literal
- Applies a left shift (`<<`) by 2 bits
- Prints the result, showing how bits are shifted to the left
- Demonstrates the use of bitwise shift operators in Java.

Author: Someshdiwan

Section5OperatorExpression/src/Bitwise4.java

@@ -1,10 +1,9 @@
-public class Bitwise4
-{
+public class Bitwise4 {
     public static void main(String[] args) {
         int x = 0b100; //10;
 
         int y;
-        y = x<<2;
+        y = x<<2; //left shift operator. shifting x value by the 2 bits.
         System.out.println(y);
     }
-}
+}