Remember to actually add the documentation files...

doc/disk-agat.md

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+# Agat 840kB 5.25" 80-track DS (ro)
+
+The Agat (Russian: ↊fd74
+1983. These were based around a 6502 and were nominally Apple II-compatible
+although with enough differences to be problematic.
+
+They could use either standard Apple II 140kB disks, or a proprietary 840kb
+MFM-based double-sided format. FluxEngine supports both of these; this profile
+is for the proprietary format. for the Apple II format, use the `apple2`
+profile.
+
+## Options
+
+(no options)
+
+References
+----------
+
+  - [Magazine article on the
+        Agat](https://sudonull.com/post/54185-Is-AGAT-a-bad-copy-of-Apple)
+
+  - [Forum thread with (some) documentation on the
+        format](https://torlus.com/floppy/forum/viewtopic.php?t=1385)
+