New API Support: Project Integration Google Chat

New API / Endpoint

API documentation: https://docs.gitlab.com/api/project_integrations/#google-chat

Additional Details

• I'd like to contribute it myself

Implementation Guide

The code in client-go has a strong pattern that is repeatable when adding support for new APIs.

• Read the instructions in CONTRIBUTING.md to get your local development environment set up.
• Follow the instructions in AddingAPISupport.md.
  • This file includes instructions for adding all endpoints of an API.
  • It also describes how to write functions for each type of endpoint, so can be used for adding new endpoint support as well.
  • Add support for all three endpoints in the Google Chat integration API.