Add link to sample-cli-plugin in developer guide

[chriskim06]

Let me know if the wording of this should be changed at all.

Fixes #328

[codecov-io]

Codecov Report

Merging #466 into master will not change coverage.
The diff coverage is n/a.

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##           master     #466   +/-   ##
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  Coverage   56.52%   56.52%           
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  Files          19       19           
  Lines         927      927           
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  Hits          524      524           
  Misses        350      350           
  Partials       53       53

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[ahmetb]

I think there are some changes we made to the sample-cli-plugin that aren’t merged still after such a long time. In that case we don’t need to link out until they’re merged.

[chriskim06]

Sounds good, should I just close this?

[ahmetb]

lets keep it open.
I'm thinking a major Developer Guide overhaul. Would be useful to incorporate there perhaps.
/lifecycle frozen

[ahmetb]

Honestly I think it's ok sample-cli-plugin doesn't mention Krew in this case.
Krew has enough momentum now.

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahmetb, chriskim06

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