docs: Added UNIX V10 Manuals

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+.pa 1
+.he 'DIRECTORY (V)'3/15/72'DIRECTORY (V)'
+.ti 0
+NAME		format of directories
+.sp
+.ti 0
+DESCRIPTION	A directory
+behaves exactly like an ordinary file, save that no
+user may write into a directory.
+The fact that a file is a directory is indicated by
+a bit in the flag word of its i-node entry.
+
+Directory entries are 10 bytes long.
+The first word is the i-number of the file represented
+by the entry, if non-zero; if zero, the entry is empty.
+
+Bytes 2-9 represent the (8-character)
+file name, null padded on the right.
+These bytes are not cleared for empty slots.
+
+By convention, the first two entries in each directory
+are for "." and "..".  The first is an entry for the
+directory itself.  The second is for the parent
+directory.
+The meaning of ".." is modified for the root directory
+of the master file system and for the root directories of removable
+file systems.
+In the first case, there is no parent, and in the second,
+the system does not permit off-device references.
+Therefore in both cases ".." has the
+same meaning as ".".
+.sp
+.ti 0
+SEE ALSO	file system (V)