Hello World! in Java Spring Boot

This is the venerable Hello World application using the Spring Boot Java framework. We will create the application from scratch using the Eclipse IDE by:
1. Creating a Spring Boot application.
3. Creating a controller class using the @Controller annotation.
4. Creating a method in the controller class to tell the framework what to serve up for any requests to the root of the server using the @GetMapping annotation.

Required to follow along:
- Java Open JDK14 installed and properly configured
- Eclipse IDE for Enterprise Java Developers installed
- The Spring Tools 4 added to your Eclipse IDE