docs: update README.md about v0.5.0 release

[pmalek]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

This PR introduces (already released) v0.5.0 into README.md and mentions which beta features this version supports.

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @pmalek. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[shaneutt]

Thanks for noticing this!

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: pmalek, shaneutt

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[pmalek]

@pmalek: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name Commit Details Required Rerun command
pull-gateway-api-verify 5159dd2 link true /test pull-gateway-api-verify
Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

This is some crazy stuff here:

go: cloud.google.com/go@v0.81.0: Get "https://proxy.golang.org/cloud.google.com/go/@v/v0.81.0.mod": stream error: stream ID 23; INTERNAL_ERROR; received from peer

/retest-required

[k8s-ci-robot]

@pmalek: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

@pmalek: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name Commit Details Required Rerun command
pull-gateway-api-verify 5159dd2 link true /test pull-gateway-api-verify
Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

This is some crazy stuff here:

go: cloud.google.com/go@v0.81.0: Get "https://proxy.golang.org/cloud.google.com/go/@v/v0.81.0.mod": stream error: stream ID 23; INTERNAL_ERROR; received from peer

/retest-required

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[shaneutt]

/ok-to-test