Add OWNERS files for approvers definition and update community docs

[FillZpp]

Signed-off-by: Siyu Wang FillZpp.pub@gmail.com

Ⅰ. Describe what this PR does

Add OWNERS files for approvers definition and update community docs.

[FillZpp]

/cc @hormes

[jasonliu747]

有 alias 了，但貌似没有具体同学的名单

[FillZpp]

@jasonliu747 I expect those approvers could post PRs to add them into the approver alias, or I can complete the alias for all of them. Which one do you think is better?

[jasonliu747]

@FillZpp sure, SGTM.
/lgtm

[codecov]

Codecov Report

Base: 67.91% // Head: 67.92% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (a36f5e2) compared to base (39cb1d1).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #801      +/-   ##
==========================================
+ Coverage   67.91%   67.92%   +0.01%     
==========================================
  Files         216      216              
  Lines       24368    24368              
==========================================
+ Hits        16549    16553       +4     
+ Misses       6675     6668       -7     
- Partials     1144     1147       +3     

Flag	Coverage Δ
unittests	67.92% <ø> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/koordlet/runtimehooks/reconciler/reconciler.go	78.94% <0.00%> (-2.11%)	⬇️
pkg/util/httputil/reverseproxy.go	85.63% <0.00%> (+0.79%)	⬆️
pkg/koordlet/statesinformer/states_pods.go	56.73% <0.00%> (+2.12%)	⬆️

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[hormes]

/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hormes, jasonliu747

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [hormes]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment