site: add a beginner tutorial for Go
This augments the beginner tutorials for C++, Java, Android, and iOS.
I kept the structure similar to the C++ tutorial but included some brief information on MODULE.bazel, since that's required for rules_go.
Examples PR: bazelbuild/examples#519
A gentle ping for review. I sent this just before Bazelcon, so I apologize for the awkward timing.
Thanks for reviewing! https://github.com/bazelbuild/examples/pull/519 has the example code for this, so let me know if you have feedback for that one, too.
I had to make some small tweaks while importing this PR based on https://developers.google.com/style, feel free to send follow up PRs if you think some of the modifications don't make sense.
Looks good! Thanks again for reviewing and publishing.
Thanks for the nice documentation!