Adding documentation to RazorEngineCompilationOptionsBuilder

[MichaelCleverdon]

Hi! I was recently working with your library, and found some difficulty in debugging my integration with it because of a lack of understanding around when I should be using AddUsing() vs AddReferenceByName(). I eventually got everything good to go, but that was only after digging into the repo to understand what each method did under the hood. I understand not wanting to display everything that goes on under the hood, but I wanted to add some documentation on what each of the different method did in the builder options area. That way people don't need to dig into the repo if they have a simple use case, but aren't aware of how to implement it properly

If you're wanting to see how the comments look, pulling down the branch and hovering over the method should show the method comments

If you have verbiage recommendations, I would love to hear them

Thanks!

[adoconnection]

Hi, Michael! Documentation is warmly welcome 🔥 Thanks!