[Storage] Added samples of auth with TokenCredentials to Azure.Storage.Files.Shares

sdk/storage/Azure.Storage.Files.Shares/samples/Sample02_Auth.cs

@@ -75,15 +75,15 @@ public async Task SharedKeyAuthAsync()
             // Create a SharedKeyCredential that we can use to authenticate
             StorageSharedKeyCredential credential = new StorageSharedKeyCredential(accountName, accountKey);
 
-            // Create a client that can authenticate with a connection string
+            // Create a client that can authenticate with a SharedKeyCredential
             ShareServiceClient service = new ShareServiceClient(serviceUri, credential);
 
             // Make a service request to verify we've successfully authenticated
             await service.GetPropertiesAsync();
         }
 
         /// <summary>
-        /// Use a shared access signature to acces a Storage Account.
+        /// Use a shared access signature to access a Storage Account.
         ///
         /// A shared access signature (SAS) is a URI that grants restricted
         /// access rights to Azure Storage resources. You can provide a shared
@@ -133,5 +133,26 @@ public async Task SharedAccessSignatureAuthAsync()
                     async () => await service.CreateShareAsync(Randomize("sample-share")));
             Assert.AreEqual(403, ex.Status);
         }
+
+        /// <summary>
+        /// Use a TokenCredential to access a Storage Account.
+        ///
+        /// TokenCredential represents credentials used to acquire
+        /// OAuth 2.0 access tokens for authenticating requests to Azure services.
+        /// </summary>
+        [Test]
+        public async Task TokenCredentialAuthAsync()
+        {
+            // Create a TokenCredential that we can use to authenticate
+            TokenCredential credential = new DefaultAzureCredential();
+
+            // Create a client that can authenticate with a TokenCredential
+            ShareServiceClient shareServiceClient = new ShareServiceClient(
+                StorageAccountFileUri,
+                credential);
+
+            // Make a service request to verify we've successfully authenticated
+            await shareServiceClient.GetPropertiesAsync();
+        }
     }
 }