Add rainier.md in cndw-2024

[rainierrr]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind documentation

What this PR does / why we need it: Add rainier.md in cndw-2024

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

/sig testing /sig docs

[linux-foundation-easycla[bot]]

• :white_check_mark:login: rainierrr / (6156bde5dc8c6516b4ddd3af2710a0e24444dc8b)

The committers listed above are authorized under a signed CLA.

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[nasa9084]

/lgtm /meow

[k8s-ci-robot]

@nasa9084:

In response to [this](https://github.com/kubernetes-sigs/contributor-playground/pull/1557#issuecomment-2499763251): >/lgtm >/meow Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[Okabe-Junya]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Okabe-Junya, rainierrr

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Needs approval from an approver in each of these files: - ~~[japan/OWNERS](https://github.com/kubernetes-sigs/contributor-playground/blob/master/japan/OWNERS)~~ [Okabe-Junya] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[rainierrr]

/this-is-fine

[k8s-ci-robot]

@rainierrr:

In response to [this](https://github.com/kubernetes-sigs/contributor-playground/pull/1557#issuecomment-2499773773): >/this-is-fine Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[rainierrr]

/joke

[k8s-ci-robot]

@rainierrr: Bad at golf? Join the club.

In response to [this](https://github.com/kubernetes-sigs/contributor-playground/pull/1557#issuecomment-2499797481): >/joke Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[rainierrr]

/shrug