move to using PRIVATE_KEY and use the String version (great that it supports that 👍)
remove the copyright from each file and ensure we have a LICENSE file in the repo
provide instructions to execute a command to run this example in the README. There will be multiple examples so I'm guessing this won't be a gradle command
Well technically if you don't provide the copyright, then you're not giving people permission to use it - default copyright is pretty restrictive!
(But the main reason it's in there is because it's in my IDE's Java template. Happy to take it out if you think it's intimidating!)