Fix for first time use of api with clientid/clientsecret.

FarmmapsApiSamples/NbsApp.cs

@@ -38,6 +38,9 @@ namespace FarmmapsApiSamples
         {
             try
             {
+                // !! this call is needed the first time an api is called with a fresh clientid and secret !!
+                await _farmmapsApiService.GetCurrentUserCodeAsync();
+                
                 var roots = await _farmmapsApiService.GetCurrentUserRootsAsync();
                 var uploadedRoot = roots.SingleOrDefault(r => r.Name == "Uploaded");
                 var myDriveRoot = roots.SingleOrDefault(r => r.Name == "My drive");