Create a Tag Helper to make adding a CSS class to an element conditionally prettier

[DamianEdwards]

Something like this:

<h1 class-if-className="@Model.SomeBoolExpressionHere"></h1>

Some things to consider:

• Translation of casing from attribute name to class name, e.g. camelCase -> kebab-case?, underscores vs. dashes in class names
• Multiple uses on same Tag Helper, i.e. composition of multiple class name values into single attribute value output
• Anything that will make @terrajobst happy