add docs for defragmentation strategy

[LegGasai]

What type of PR is this?

/kind documentation /area scheduling /area descheduling

What this PR does / why we need it:

A design documentation for Coordinate descheduler and Volcano to support resource defragmentation

Which issue(s) this PR fixes:

Fixes #3948

Special notes for your reviewer:

@Monokaix @JesseStutler

Does this PR introduce a user-facing change?

[volcano-sh-bot]

Welcome @LegGasai!

It looks like this is your first PR to volcano-sh/volcano.

Thank you, and welcome to Volcano. :smiley:

[volcano-sh-bot]

@LegGasai: The label(s) area/descheduling cannot be applied. These labels are supported: ``

In response to this:

What type of PR is this?

/kind documentation /area scheduling /area descheduling

What this PR does / why we need it:

A design documentation for Coordinate descheduler and Volcano to support resource defragmentation

Which issue(s) this PR fixes:

Fixes #3948

Special notes for your reviewer:

@Monokaix @JesseStutler

Does this PR introduce a user-facing change?

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.

[LegGasai]

/assign @Monokaix /assign @JesseStutler

[Monokaix]

Hi，please signoff your commit with git commit -s first.

[volcano-sh-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

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[googs1025]

/cc

I'm interested in this topic and I'll try to review it!

[Shrutim1505]

U can squash commit to 1 commit @LegGasai

[LegGasai]

U can squash commit to 1 commit @LegGasai

Done

[JesseStutler]

@LegGasai Hi, please sign off your commit by git commit -s

[JesseStutler]

@LegendGasai Please also squash your commits into one, thanks

[JesseStutler]

/gemini review

[gemini-code-assist[bot]]

[!WARNING] Gemini encountered an error creating the review. You can try again by commenting /gemini review.

[JesseStutler]

/gemini review

[gemini-code-assist[bot]]

[!WARNING] Gemini encountered an error creating the review. You can try again by commenting /gemini review.