feat: Add Primitives class to demonstrate Java primitive data types and type casting

Add a program that:
- Declares and initializes variables of various primitive types: int, char, float, double, long, boolean
- Demonstrates usage of post-increment on a float variable
- Includes a commented line showing how to perform explicit type casting
- Provides a basic overview of memory-efficient primitive type usage in Java.

Author: Someshdiwan

Section5OperatorExpression/src/Primitives.java

@@ -9,7 +9,9 @@ public static void main(String[] args) {
 
         float c = 30.6f;
         c++;
-//        c = (int)(c) + 1;
+
+        //c = (int)(c) + 1;
+
         System.out.println(c);
     }
 }