Add a brief README describing how to import core code into Yaffs Direct

Signed-off-by: Charles Manning <cdhmanning@gmail.com>

diff --git a/direct/README.txt b/direct/README.txt
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+New Handling for Yaffs Core Code in Yaffs Direct
+
+In the past, the Yaffs core code was joined into the Yaffs direct code by
+means of symbolic links. This had to be changed when some Linux
+kernel-friendly changes were made.
+
+Now, the Yaffs core code needs to be slightly modified before use in Yaffs
+Direct. This is accomplished by a script that copies the code intto the
+Yaffs Direct "workspace" while using sed to modify some of the function 
+names etc. For example, strlen() is changed to yaffs_strlen() to allow these
+functions to be twaeked for use with unicode.
+
+This is accomplished by the script called handle_common.sh.
+
+cd yaffs2/direct
+./handle_common.sh copy
+