[docs] update README to add information about HTTP/3 support

[ipaqsa]

Update README to add information about HTTP/3 support status

What this PR does / why we need it:

It provides updates for README to describe HTTP/3 support status.

README describes the current status, the problem with OpenSSL and the next steps to add HTTP/3 support.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] CVE Report (Scanner found CVE and adding report)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] Documentation only

Which issue/s this PR fixes

Fixes #11502

Checklist:

• [ ] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] I've read the CONTRIBUTION guide
• [ ] I have added unit and/or e2e tests to cover my changes.
• [ ] All new and existing tests passed.

[k8s-ci-robot]

Hi @ipaqsa. Thanks for your PR.

I'm waiting for a kubernetes 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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[Gacko]

/triage accepted /kind documentation /priority backlog /cc @longwuyuan /uncc

[Gacko]

/cherry-pick release-1.10

[k8s-infra-cherrypick-robot]

@Gacko: once the present PR merges, I will cherry-pick it on top of release-1.10 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.10

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[Gacko]

/retitle Docs: Add information about HTTP/3 support.

[longwuyuan]

Hopefully all HTTP3 PRs are linked.

Small nit - if/when comfortable, then please squash commits

[Gacko]

/lgtm

[Gacko]

The build job will probably fail, but this is not related to your PR.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Gacko, ipaqsa

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[k8s-infra-cherrypick-robot]

@Gacko: new pull request created: #11525

In response to this:

/cherry-pick release-1.10

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-sigs/prow repository.