feat: Demonstrate basic array declaration, initialization, and default values in Java

🧠 Logic:
- Declares primitive types (`int`, `String`) and introduces array syntax.
- Initializes arrays with `new` and shows default values (`int` defaults to 0, `String` to null).
- Explains stack vs. heap for array references and objects.
- Example includes both individual variables and grouped data using arrays.

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

Author: Someshdiwan

Section9ArrayAB/Array IMP/ModificationOfArray.java

@@ -1,5 +1,4 @@
 public class ModificationOfArray {
-
     public static void main(String[] args) {
         // Q: store a roll number
         int a = 19;