Documentation request for Flash

[stc1988]

Flash class is not yet documented.. Or, if documentation is difficult, it would be helpful to have a brief explanation of scenarios where this class is used or an example application.

[phoddie]

It is true that the Flash class is not described in files.md. There is quite a bit of information available, however.

• The Flash class is not documented in this repository, but it is covered in depth in the Files chapter of our book.
• There are three examples of using Flash in our book. Its repository of examples contains those.
• There are unit tests in this repository.
• The contributed Giphy app uses Flash to stored the downloaded animated GIF.

I suppose we could generate some basic documentation based on these sources.

[stc1988]

First, I'll read it since I already have the book.