update(docs): update readme to explain what it is briefly

[sanposhiho]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

update docs to explain what it is briefly

Which issue(s) this PR fixes:

Fixes #3

Special notes for your reviewer:

Does this PR introduce a user-facing change?

No.

[sanposhiho]

Sorry, opened it because I wanted to check the bot's behavior. Actually, it's WIP yet.

/hold

[sanposhiho]

/kind documentation /unhold

[sanposhiho]

/label tide/merge-method-squash

[sanposhiho]

PTAL @kerthcet @codefromthecrypt

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: codefromthecrypt, sanposhiho

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubernetes-sigs/kube-scheduler-wasm-extension/blob/main/OWNERS)~~ [sanposhiho] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[sanposhiho]

@kerthcet could you check this one again please?

[kerthcet]

/lgtm /label tide/merge-method-squash