feat: Demonstrate usage of Java String substring() method

- Created a simple `Substring` class to showcase the `substring(int beginIndex)` method of the `String` class.
- Defined a string variable `name` with the value "Virat Kholi".
- Extracted a substring starting from index 5 using `name.substring(5)`, which returns "Kholi".
- Printed the resulting substring to demonstrate how the method returns the portion of the string from the specified index to the end.

This commit provides a basic example of Java's substring functionality, useful for string manipulation tasks.

Signed-off-by: Somesh diwan <[email protected]>

Author: Someshdiwan

Section6StringClassPrinting/Engineering Digest ED/src/Substring.java

@@ -5,4 +5,4 @@ public static void main(String[] args) {
         String substring = name.substring(5);
         System.out.println(substring);
     }
-}
+}