lmajowka/btcgo ? reverse-engineered prompt

Build me a simple Go app called BTC GO that runs from the terminal and is easy to build on Windows, Linux, and Mac, plus inside Docker. I want it to feel like a small utility for finding BTC related data, with a straightforward command line experience and clear output in the console.

Please make sure the project can be built with Go commands, runs cleanly as a single executable, and has everything needed to get started fast. If anything is unclear, check the current docs online and keep the setup as simple as possible. I’d also like the Docker support to work out of the box so someone can clone the repo, build it, and run it without a lot of extra steps.

Keep the code organized and leave the project in a state where a normal person can follow the README and get it running right away.