Adding several vSphere 6.5 API examples

Scripts/ESXInstallDate.ps1

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+<#
+.SYNOPSIS Retrieve the installation date of an ESXi host
+.NOTES  Author:  William Lam
+.NOTES  Site:    www.virtuallyghetto.com
+.NOTES  Reference: http://www.virtuallyghetto.com/2016/10/super-easy-way-of-getting-esxi-installation-date-in-vsphere-6-5.html
+.PARAMETER Vmhost
+  ESXi host to query installation date
+.EXAMPLE
+  Get-Vmhost "mini" | Get-ESXInstallDate
+#>
+
+Function Get-ESXInstallDate {
+    param(
+        [Parameter(
+            Mandatory=$true,
+            ValueFromPipeline=$true,
+            ValueFromPipelineByPropertyName=$true)
+        ]
+        [VMware.VimAutomation.ViCore.Impl.V1.Inventory.InventoryItemImpl]$Vmhost
+     )
+
+     if($Vmhost.Version -eq "6.5.0") {
+        $imageManager = Get-View ($Vmhost.ExtensionData.ConfigManager.ImageConfigManager)
+        $installDate = $imageManager.installDate()
+
+        Write-Host "$Vmhost was installed on $installDate"
+     } else {
+        Write-Host "ESXi must be running 6.5"
+     }
+}