Add data/ directory and go-bindata generate cmds

data/README.md

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+# Embedded data files for diskii
+
+## List of files
+-  ProDOS_2_4_1.dsk
+   John Brooks' update to ProDOS, released September 2016.
+   [Announcement on Call-A.P.P.L.E](http://www.callapple.org/vintage-apple-computers/apple-ii/announcing-prodos-2-4-1-for-all-apple-ii-and-compatible-computers/)
+
+- prodos-old-boot0.bin
+  The old ProDOS sector 0, used before the IIGS System 4.0 system disk.
+- prodos-new-boot0.bin
+  The new ProDOS sector 0, used on and after the IIGS System 4.0
+  system disk. Understands sparse PRODOS.SYSTEM files.

generate.go

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+// This file contains the list of commands to run to re-generate
+// generated files.
+
+// Use go-bindata to embed static assets that we need.
+//go:generate go-bindata -pkg data -prefix "data/" -o data/data.go data/disks data/boot
+//go:generate goimports -w data/data.go
+
+package main