[Feature Request] Support `.razor` files

[lonix1]

Hi @stkb

The extension works in C# (.cs) files, but not in razor / blazor files (.razor) - which is a templating format for frontend code, and is HEAVILY used in the aspnet platform.

The comment format is identical to what you'd find in c# files, e.g.:

/// <summary>
/// Foo foo foo...
/// </summary>

One only needs to activate the extension on .razor files, using the same code as that for .cs files - there's no other change.

Please consider it? Razor files are massive part of the aspnet platform thesedays, and it's painful to do any work without your excellent extension! :smile: