Create a Spring boot controller implementation of the boiler plate code

[drachomi]

For someone who uses springboot for developing API's i had to convert the HttpServlet boiler plate to a spring controller code. A lot of developers use springboot and would just want to add the webhook as a controller method in their already built API.

I have created a simple controller implementation and want to add it to the boiler plate on approval.

[taycaldwell]

Hi @imohchard,

Thank you for the suggestion. I agree that a Spring Boot example would be beneficial for other developers.

If you wish to submit a PR with these updates, I would be happy to review it.

Best,