[Hold]: Add CI to sync docs from source code repo to content repo

[SummerSun]

Description

Created appveyor.yml required for CI.

Sanketh will continue with the work of setting webhook. It will be set to monitor each git tag push event of this repo (branch to be decided). Build script in appveyor.yml decides whether there is a release of this tag. If the answer is yes, download the release zip, find out the documents and drag them to content repo.

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[azurecla]

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[azuresdkci]

Can one of the admins verify this patch?

[shahabhijeet]

@SummerSun any reason this has to happen on powershell CI?
Can this be done locally as a service or best do the same tracking on content repo CI?

[shahabhijeet]

@azuresdkci add to whitelist

[shahabhijeet]

@SummerSun is this ok to expose?

[SummerSun]

Yeah, it was encrypted already by ci.