There are two introductory guides you should read before proceeding:
CONTRIBUTING: The Contributing guide is a detailed document which describes the different ways you can contribute to Gophercloud and how to get started. This tutorial you're reading is very similar to that guide, but presented in a different way. We still recommend you read it over.
STYLE: The Style Guide documents coding conventions used in the Gophercloud project.
When you've finished reading those guides, proceed to Step 2.