txt/: Add common file for derivatives

Signed-off-by: Gene Cumm <gene.cumm@gmail.com>

diff --git a/txt/com-derv.txt b/txt/com-derv.txt
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+
+// == DERIVATIVES ==
+
+The *Syslinux* suite contains several boot loader (core) derivatives (variants), currently based solely on the boot media:
+
+       *SYSLINUX* - Disk (floppy/hard disk) based
+       *PXELINUX* - PXE network booting
+       *ISOLINUX* - ISO9660 (CD/DVD; El Torito) based
+
+Prior to v4.00, *SYSLINUX* was only for FAT12/FAT16/FAT32 and another derivative, *EXTLINUX*, was for ext2/ext3 file systems, whose functionality has been merged into *SYSLINUX*.
+