adding files for build process

.build/Download-XamarinComponents.ps1

@@ -0,0 +1,22 @@
+function Expand-ZIPFile($file, $destination)
+{
+    $shell = new-object -com shell.application
+    $zip = $shell.NameSpace($file)
+    foreach($item in $zip.items())
+    {
+        $shell.Namespace($destination).copyhere($item)
+    }
+}
+
+IF(-NOT (Test-Path "C:\Xamarin")){
+  New-Item -ItemType Directory -Path C:\ -Name Xamarin
+}
+
+Push-Location C:\Xamarin
+
+IF(-NOT (Test-Path "C:\Xamarin\xamarin-component.exe")) {
+  Invoke-WebRequest -Uri https://components.xamarin.com/submit/xpkg -OutFile xpkg.zip -UseBasicParsing
+  Expand-ZIPFile -file C:\Xamarin\xpkg.zip -destination C:\Xamarin
+}
+
+Pop-Location

.build/Restore-XamarinComponents.ps1

@@ -0,0 +1 @@
+. C:\Xamarin\xamarin-components.exe restore $args[0]