Add unmaintained notice to contrib components

[annajung]

Signed-off-by: Anna Jung (VMware) [email protected]

Which issue is resolved by this Pull Request:
Part of #2311

Description of your changes:

• Add README to the following components to mark the directory as unmaintained and out of date
  • /contrib/application
  • /contrib/basic-auth
  • /contrib/experimental
  • /contrib/gatekeeper
  • /contrib/modeldb
  • /contrib/spartakus

cc @kimwnasptd @kubeflow/wg-manifests-leads

[annajung]

The OWNERS file is not available, therefore, am not sure who originally created the component.
Based on the design doc and commit history, I'm tagging @yanniszark to ensure the component OWNER(s) are aware of the out-of-date label put on the component.

cc @kimwnasptd

[annajung]

To remove the unmaintained label, check out the `missing requirements #2311 and leave a comment on the issue to indicate that you'll take action to provide the missing requirements and are willing to keep the component up to date. Thank you!

[kimwnasptd]

The message looks good. @annajung I'm guessing we are going to use the same for the other READMEs as well right? I.e. https://github.com/kubeflow/manifests/tree/master/contrib/feast

[annajung]

@kimwnasptd Yes, that's the plan. I'm creating a separate PR for each component to ensure that the relevant components' owners are tagged.

[annajung]

@kimwnasptd Update: The components that did not have the OWNERS file are merged into this PR now. Rest that requires tagging owners for awareness will be a separate PR

[annajung]

/retitle Add unmaintained notice to contrib components

[kimwnasptd]

I like the approach of first tackling the components without OWNERs. Then we can move on with the unmaintained ones.

/lgtm
/approve

[google-oss-prow]

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