- Explain some of the prerequisites in more detail (Go version).
- Practical issues around Go version and Docker configuration to make it work.
- Make the first example be one that works with nimbus-eth1.
(Instead of giving an obscure error message that looks like the user's Docker
setup is broken).
- Rename to `README.md` per convention.
Signed-off-by: Jamie Lokier <jamie@shareable.org>