Document deploying MR locally on a kind cluster for development

[alexcreasy]

Description

Adds documentation for running MR backend locally via kind.

How Has This Been Tested?

No code changes, you can follow the guide and see if it works for you if you wish.

Merge criteria:

• [x] The commits and have meaningful messages; the author will squash them after approval or will ask to merge with squash.
• [x] Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• [x] The developer has manually tested the changes and verified that the changes work

[ederign]

/lgtm

[google-oss-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ederign, Griffin-Sullivan

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