Add documentation button to pnp sample

[JimacoMS4]

Checklist

• [x ] I have read the [contribution guidelines] (https://github.com/Azure/azure-iot-sdk-node/blob/master/.github/CONTRIBUTING.md).
• [NA ] I added or modified the existing tests to cover the change (we do not allow our test coverage to go down).
• If this is a modification that impacts the behavior of a public API
  • [ NA] I edited the corresponding document in the devdoc folder and added or modified requirements.

Reference/Link to the issue solved with this PR (if any)

Description of the problem

Description of the solution

Just adding a documentation button to the PNP sample that points to https://docs.microsoft.com/en-us/azure/iot-develop/ . Part of documentation effort.

[JimacoMS4]

@timlt Please check out this PR before I send email to Eric. I want to make sure we're on the same page with the following:

• I added image files for all four of the doc buttons in their own folder in the existing doc/images folder.
• You can see how the button renders here: https://github.com/JimacoMS4/azure-iot-sdk-node/tree/add-documentation-button-to-pnp-sample/device/samples/pnp

Thanks,

Jimaco

[timlt]

Looks good to go!

[ericmitt]

Good for me as well. Thanks

[JimacoMS4]

sign-off

[JimacoMS4]

@ericmitt I'm not sure what else I need to do here to get this merged (Note I just closed and re-opened the request, so some checks might be in-progress). It's been sitting for several days.

[JimacoMS4]

@pierreca @BertKleewein @anthonyvercolano can you please merge or let me know what else needs to be done? I'm not sure what to do to get the tests to complete, but the PR just adds some images for doc support and a button that points back to docs to one of the samples.

[YoDaMa]

@JimacoMS4 thanks for your patience. we're gonna get this merged in now.

[YoDaMa]

/azp run

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