Indeterminate Progress Bar Support

[adam8797]

An important feature of progress bars is that they have an indeterminate mode, for situations when we want to convey to the user that we're still working, but we have no idea what the progress of the action is.

Is this something that could be added?

[0xced]

There's an excellent library that handle indeterminate progress reporting for .NET Standard: Kurukuru. It's well documented, well architected and has a wide range of predefined spinner styles.

[peter-shinydocs]

Or you could just have an option to not display the percentage.

[Mpdreamz]

Implemented as per #74 thanks to @peter-shinydocs #74