add w-ko as a contributor for code

[allcontributors]

Adds @w-ko as a contributor for code.

This was requested by Piedone in this comment

[skip ci]

[dotnet-policy-service]

@allcontributors[bot] please read the following Contributor License Agreement(CLA). If you agree with the CLA, please reply with the following information.

@dotnet-policy-service agree [company="{your company}"]

Options:

• (default - no company specified) I have sole ownership of intellectual property rights to my Submissions and I am not making Submissions in the course of work for my employer.

@dotnet-policy-service agree

• (when company given) I am making Submissions in the course of work for my employer (or my employer has intellectual property rights in my Submissions by contract or applicable law). I have permission from my employer to make Submissions and enter into this Agreement on behalf of my employer. By signing below, the defined term “You” includes me and my employer.

@dotnet-policy-service agree company="Microsoft"

Contributor License Agreement

Contribution License Agreement

This Contribution License Agreement ( “Agreement” ) is agreed to by the party signing below ( “You” ),
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[allcontributors]

@dotnet-policy-service[bot]

I could not determine your intention.

Basic usage: @all-contributors please add @Someone for code, doc and infra

For other usages see the documentation

[Piedone]

Will be added as part of #15392.