Exercise 1: Add a cleosrv subcommand that prints your name

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* Implement what is suggested
* Submit a pull request to get it reviewed and improvement suggestions made
* Write a "I did it!" comment in this issue when you are done so we can celebrate with you

Of course the pull request will end up being rejected because it's only an exercise, but you'll get a lightweight introduction to some project internals.

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# Exercise

When executing `cleosrv myname` it should print your name in the console.

Don't forget to write a test for it!

Start by locating the cleosrv command entry point and the existing subcommand tests. Implement the `cleosrv myname` behavior so it prints the supplied name, then add and run a test covering that command.

Written by the indexing model from the issue text.