[Coco] AGD production toolchain updated

[Pere Serrat]

Hello,
this is just to let you know that the 6809 AGD production toolchain
has been updated in Github.
https://github.com/oss003/Dragon-AGD-Suite

Besides, we have added my AGD graphics editor for maybe someone would
like to 'edit' the elements of a game to convert it to PMode3

You'll find an AGD file viewer, by Tony Thompson, it's very handy!
cheers
Pere Serrat