Create a new Java based server to handle user inputs

[OhmGeek]

The existing Python based server works in simple cases, but there are several issues:

• Everything uses REST, which doesn't scale well for the emulator side (since UDP would be preferable for the emulator)
• Python dictionary can't easily handle concurrency. Replacing this with a ConcurrentHashMap would be ideal.

Therefore, we need to:

• create a new server project (leaving the old one within the repo for now).
• This project will be extended to add a REST controller, controller service, and the UDP controller in future issues.

[OhmGeek]

PR #19