Update documentation.

README.md

@@ -4,9 +4,15 @@ FluxEngine
 (If you're reading this on GitHub, the formatting's a bit messed up. [Try the
 version on cowlark.com instead.](http://cowlark.com/fluxengine/))
 
-**Breaking news!** As of 2022-09-09, there's new filesystem support. Read (and
-sometimes write) files directly from (and to) your disks! It works in the GUI,
-too. See the details below.
+**Breaking news!** As of 2022-09-09, there's new [filesystem
+support](doc/filesystem.md). Read (and sometimes write) files directly from
+(and to) your disks, with eight different file systems! It works in the GUI,
+too, which is available for Linux (and other Unix clones), Windows and OSX. See
+the details below.
+
+<div style="text-align: center">
+<a href="screenshot.jpg"><img src="screenshot.jpg" style="width:80%" alt="screenshot of the GUI in action"></a>
+</div>
 
 What?
 -----

doc/filesystem.md

@@ -19,10 +19,11 @@ The following file systems are supported so far.
 | Amiga FFS                                |   Y   |   Y    | Both OFS and FFS |
 | Brother 120kB                            |   Y   |   Y    |       |
 | Commodore CbmFS                          |   Y   |        | Only 1541 disks so far |
-| CP/M                                     |   Y   |        | For selected formats |
-| FatFS (a.k.a. MS-DOS)                    |   Y   |   Y    | FAT12, FAT16, FAT32, but only SFN; not Atari |
+| CP/M                                     |   Y   |        | Requires configuration for each machine |
+| FatFS (a.k.a. MS-DOS)                    |   Y   |   Y    | FAT12, FAT16, FAT32; not Atari (AFAIK!) |
 | Macintosh HFS                            |   Y   |   Y    | Only AppleDouble files may be written |
 | Apple ProDOS                             |   Y   |        |       |
+{: .datatable }
 
 Please not that Atari disks do _not_ use standard FatFS, and the library I'm
 using for the heavy lifting (ChaN's