Create the reviewers guide base document
What does this MR do?
Adds a base of a guidance document for GitLab Runner reviewers. Inspired by the discussion at https://gitlab.slack.com/archives/CBQ76ND6W/p1551803645032500.
The 17.0 major release is coming on May 16, 2024! This version brings many exciting improvements to GitLab, but also removes some deprecated features. We are introducing three breaking change windows during which we expect breaking changes to be deployed to GitLab.com. You can read more about it on our blogpost. The first breaking change window begins 2024-04-22 09:00UTC and ends 2024-04-24 22:00UTC.
Adds a base of a guidance document for GitLab Runner reviewers. Inspired by the discussion at https://gitlab.slack.com/archives/CBQ76ND6W/p1551803645032500.