Add "not maintained" notice to other operator repos

[terrytangyuan]

We should add notice to all other operator repos and freeze code changes. Let's use this issue to discuss the wording before adding the notice to the top of the README files in those repos.

/cc @kubeflow/wg-training-leads

[gaocegege]

SGTM.

[Jeffwan]

sounds good. Let's hold this task until we officially release the repo

[gaocegege]

Can we move forward?

[terrytangyuan]

Yes, I think so. I'll start adding notices.

[johnugeorge]

+1 to this. There are issues created in other repos even now

[johnugeorge]

Should we archive repos as well (with notice in Readme)?

[terrytangyuan]

Let me update the README and then comment in kubeflow/community#479 to see if we can include those repos as part of the archiving process.

@kubeflow/wg-training-leads Let me know if there are any concerns for archiving (pytorch, xgboost, mxnet).

[terrytangyuan]

kubeflow/pytorch-operator#361
kubeflow/mxnet-operator#99
kubeflow/xgboost-operator#125

[Jeffwan]

Let me update the README and then comment in kubeflow/community#479 to see if we can include those repos as part of the archiving process.

@kubeflow/wg-training-leads Let me know if there are any concerns for archiving (pytorch, xgboost, mxnet).

Thanks for driving the efforts. It sounds good to me. Let's give the notice and archive them later.

[terrytangyuan]

Notices were added and I commented on the issue to archive the repos. Let's track the progress there.