添加readme中的node版本要求以及支持windows下yarn serve的跨平台运行

[zhujiaxin]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

在windows版本yarn serve会因为没有添加cross-env无法运行，node因为node-sass的版本，需要限制在12和13版本中

Which issue(s) this PR fixes:

Fixes # None

Special notes for reviewers:

Does this PR introduced a user-facing change?

Additional documentation, usage docs, etc.:

None

[ks-ci-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: zhujiaxin To complete the pull request process, please assign zheng1 after the PR has been reviewed. You can assign the PR to them by writing /assign @zheng1 in a comment when ready.

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[ks-ci-bot]

Hi @zhujiaxin. Thanks for your PR.

I'm waiting for a kubesphere 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[zhujiaxin]

/assign @zheng1

[harrisonliu5]

please use English in this issue, Thanks.

[harrisonliu5]

Thanks for your contribution, the package.json is modified, so this PR should be closed soon.