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Adds a simple hello-world example for GCP Observability purposes along
with a README.
The microservices observability user guide is not yet up, but this still
refers to it anyway.
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- add rubocop as a dev dependency
- fixed many style violations it reported, often using --auto-correct
- add a rubocop config
- .rubocop.yml shows the exceptions
- .rubocopy_todo.yml tracks outstanding style issues
- adds a rake task to allow rubocop styling checks to be automated