Update User example to include Delete user snippet

Author: Andy Scott

README.md

@@ -239,6 +239,10 @@ UserCollection users = Company.listUsers(map);
 User user = User.find("541a144b201ebf2ec5000001");
 user.addCompany(company);
 User.update(user);
+
+// Delete a user
+User user = User.find("541a144b201ebf2ec5000001");
+User.delete(user.getId());
 ```
 
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