Added HelloWorld.java for Hacktoberfest

[Gorlesunilkumar]

This pull request adds a simple Java program HelloWorld.java as a beginner-friendly contribution for Hacktoberfest.

The program prints a greeting message: "Hello Hacktoberfest from Gorlesunilkumar!" to the console.

This contribution is intended to help beginners participate in Hacktoberfest and add a basic Java example to the repository.