[Windows] Add the list of installed PowerShell modules to documentation (#1266)

* documenation about powershell modules

* add powershell modules documenation

* add PSMODULES_ROOT_FOLDER

images/win/scripts/Installers/Install-PowerShellModules.ps1

@@ -0,0 +1,34 @@
+$ErrorActionPreference = "Stop"
+
+# Set TLS1.2
+[Net.ServicePointManager]::SecurityProtocol = [Net.ServicePointManager]::SecurityProtocol -bor "Tls12"
+
+Write-Host "Setup PowerShellGet"
+Install-PackageProvider -Name NuGet -MinimumVersion 2.8.5.201 -Force
+
+# Specifies the installation policy
+Set-PSRepository -InstallationPolicy Trusted -Name PSGallery
+
+# Install PowerShell modules
+$modules = (Get-ToolsetContent).powershellModules
+
+foreach($module in $modules)
+{
+    $moduleName = $module.name
+    Write-Host "Installing ${moduleName} module"
+
+    if ($module.versions)
+    {
+        foreach ($version in $module.versions)
+        {
+            Write-Host " - $version"
+            Install-Module -Name $moduleName -RequiredVersion $version -Scope AllUsers -SkipPublisherCheck -Force
+        }
+        continue
+    }
+
+    Install-Module -Name $moduleName -Scope AllUsers -SkipPublisherCheck -Force
+}
+
+Import-Module Pester
+Invoke-PesterTests -TestFile "PowerShellModules" -TestName "PowerShellModules"