Zhangyems patch 1

[zhangyems]

Revised on Challenge 4 &5, shorten the lab content to 30 minutes , add environment checks and screenshots.

[Marco Weber (qxsch)]

Jan Egil Ring (@janegilring) please review

[Marco Weber (qxsch)]

zhangyems please accept cla

[microsoft-github-policy-service]

zhangyems please read the following Contributor License Agreement(CLA). If you agree with the CLA, please reply with the following information.

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

Options:

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@microsoft-github-policy-service agree

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@microsoft-github-policy-service agree company="Microsoft"

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