Draft: Add ClickHouse usage docs for GitLab
What does this MR do and why?
This MR adds basic usage docs related to ClickHouse development in the GitLab Rails application.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Adam Hegyi