Add title attribute with value of error message

[khalidabuhakmeh]

When adding a validation attribute, you can specify the ErrorMessage. This message can be added to the input as a title attribute and displayed to the user.

    <div class="form-group mb-2">
        <label asp-for="Name"></label>
        <input asp-for="Name" type="text" class="form-control" 
               title="Must be Khalid or RoboCop"
               pattern="(Khalid|RoboCop)">
    </div>