add commented `diff -u' command
treee7b5468349a8a4697385ecdb29545c328e29458b
-rw-r--r-- 11651 ABOUT-NLS
-rw-r--r-- 17989 COPYING
-rw-r--r-- 653 GNUmakefile
-rw-r--r-- 7831 INSTALL
-rw-r--r-- 2329 Makefile.maint
-rw-r--r-- 1788 THANKS
drwxr-xr-x - doc
drwxr-xr-x - lib
drwxr-xr-x - m4
drwxr-xr-x - old
drwxr-xr-x - po
drwxr-xr-x - src
drwxr-xr-x - tests