README has uncompilable code, missing examples

[uhthomas]

Hi!

Really like the project, currently experimenting with it.

I noticed when setting up that a lot of the code is invalid. For instance;

load("@com_github_tnarg_rules_cue//go.bzl", cue_go_modules "go_modules")

should be

load("@com_github_tnarg_rules_cue//:go.bzl", cue_go_modules = "go_modules")

and

languages = DEFAULT_LANGUAGES + ["@com_github_tnarg_rules_cue//gazelle/cue:go_default_library"],

should be

languages = DEFAULT_LANGUAGES + ["@com_github_tnarg_rules_cue//gazelle/cue"],

It looks like cue_repository is also missing from the README. It would be nice to have some documentation for it 😄