title: How to get a list of available vm sizes in an azure location
body: <p>I want to deploy a VM in microsoft's azure with a new size.
  Usually I use a json template for the vm with size 'Standard_DS3'
  Now I would like to have another one with size a3 'A3', but this causes an error</p>
  
  <pre><code>statusMessage:{"error":{"code":"InvalidParameter","target":"vmSize","message":"The value of parameter vmSize is invalid."}}
  </code></pre>
  
  <p>So I was wondering where can I find valid vm sizes for deployments in a location and the correct name for the deployment with a template file?</p>