Add manifests dir to define K8s resources for the UI

[Griffin-Sullivan]

Description

Adding a manifests directory to the clients/ui directory for hosting our K8s resource definition files. This adds a basic deployment using kustomize for the UI and BFF. I also added a README with instructions on how to deploy using kind.

How Has This Been Tested?

Follow the steps listed in the README.

Merge criteria:

• All the commits have been signed-off (To pass the DCO check)

• The commits have meaningful messages; the author will squash them after approval or in case of manual merges will ask to merge with squash.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work.
• Code changes follow the kubeflow contribution guidelines.

If you have UI changes

• The developer has added tests or explained why testing cannot be added.
• Included any necessary screenshots or gifs if it was a UI change.
• Verify that UI/UX changes conform the UX guidelines for Kubeflow.

[lucferbux]

/lgtm

[google-oss-prow]

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In response to this:

/lgtm

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[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ederign, lucferbux

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Needs approval from an approver in each of these files:

• clients/ui/OWNERS [ederign]

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[ederign]

/lgtm