add info for using modules in Azure Devops pipeline (#89)

Author: TheOnlyWei

docs/using-in-azure-devops-pipeline.md

@@ -0,0 +1,16 @@
+## Using In Azure Devops
+
+The recommended way to test newly generated Azurestack modules in Azure Devops is to upload them to a storage accessible by your Azure Devops pipeline. For example, the following code downloads, installs, and imports the required Az.Accounts and Az.Resources modules.
+
+```
+Unregister-PSRepository -Name local -ErrorAction SilentlyContinue
+$psrepo="$env:systemdrive\psrepo"
+New-Item -Path $psrepo -ItemType Directory -force
+Invoke-WebRequest -Uri <URI_TO_AZ_ACCOUNTS_DOWNLOAD> -OutFile <AZ_ACCOUNTS_MODULE_DOWNLOADED_FILE>
+Invoke-WebRequest -Uri <URI_TO_AZ_RESOURCES_DOWNLOAD> -OutFile <AZ_RESOURCES_MODULE_DOWNLOADED_FILE>
+Register-PSRepository -Name local -SourceLocation $psrepo -InstallationPolicy Trusted
+Install-Module Az.Accounts -Repository Local
+Install-Module Az.Resources -Repository Local
+Import-Module Az.Accounts
+Import-Module Az.Resources
+```