Add ClickHouse reviewer guidelines

Adam Hegyirequested to merge
ah-clickhouse-reviewer-guides into master

What does this MR do and why?

This MR adds the initial ClickHouse reviewer guidelines.

References

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by Adam Hegyi

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