FIX MISSING CODE TO SEND EMAIL

Fix missing code in Use case to send single email to multiple users.

Author: Niladri24dutta

USE_CASES.md

@@ -350,6 +350,7 @@ namespace Example
                                                                        plainTextContent,
                                                                        htmlContent
                                                                        );
+            var response = await client.SendEmailAsync(msg);                                                          
         }
     }
 }