Character-escape addition simplified (see README.addescape, also added).

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+$Id: README.addescape,v 1.1 2009/03/03 21:07:01 kristaps Exp $
+
+This documents adding a new character escape to mdocterm(1).  Character
+escapes are only syntax-validated in the back-end.
+
+Character escape may be in the form of \*x, \*(xx, \x, \(xx, \[n] and so
+on and so on.  All of these are recognised according to their byte
+length.  
+
+(1) If the escape is NOT recognised in enum tsym in term.h, add it.
+
+(2) Modify/create static struct termenc termencN, where N is the number
+of characters in the encoding.  This is in mdocterm.c.
+
+(3) Possibly modify nescape() to recognise a new termencN.
+
+Everything else is automatic.