docs: Add link to GitHub template repo to developer guide

[marccampbell]

Adding a link to a GitHub template repo for Go projects creating krew plugins. This template has some of the best practices referenced in the guide implemented. The template also has GoReleaser configured to create a release on tag, a basic krew plugin.yaml, and all of the latest k8s client-go dependencies added and configured.

If there's a better place or wording for this, I'm happy to move/change it.

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[codecov-io]

Codecov Report

Merging #323 into master will not change coverage.
The diff coverage is n/a.

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##           master    #323   +/-   ##
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  Coverage    57.3%   57.3%           
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  Files          19      19           
  Lines         904     904           
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  Hits          518     518           
  Misses        335     335           
  Partials       51      51

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[corneliusweig]

Fits in there nicely. I think we should also link to https://github.com/kubernetes/sample-cli-plugin, but this can be done in another PR.

[ferhatelmas]

LGTM

[ahmetb]

Can we add a note that this is not maintained by Krew project?

Also we can consider adding Unofficial to the beginning.

Nit: Quick start → Quickstart.

[marccampbell]

Thanks for the suggestions. Updated the language with the word unofficial and a note that it's not not maintained by the Krew project.

[ahmetb]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahmetb, marccampbell

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