Update azure-pipelines.yml for Azure Pipelines

Author: davidbritch

azure-pipelines.yml

@@ -18,16 +18,10 @@ steps:
   displayName: 'Select the Xamarin SDK version'
   enabled: false
 
-- task: NuGetToolInstaller@1
-
-- task: NuGetCommand@2
-  inputs:
-    command: 'restore'
-    restoreSolution: '**/*.sln'
-
-- task: XamariniOS@2
+- task: MSBuild@1
+  displayName: Build iOS samples
   inputs:
-    solution: '**/*iOS.csproj'
+    solution: '**/*.iOS.csproj'
     configuration: 'Debug'
-    buildForSimulator: true
-    packageApp: false
+    msbuildArguments: '/restore /t:Build'
+