Update README.txt

Mush-map-to-tintin-converter/README.txt

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 This script was created by the player 'Tharnin' and all credit (and questions about issues) should go to him.
 
+Usage: convertmap.pl /MUSHCient/path/Aardwolf.db /ouput/path/tintinmap.tt
+
+This script requires perl, the DBI module, and the SQLite DBD backend for the
+DBI module.
+
+This script will read the database created by the MUSHClient mapper plugin of
+the Aardwolf MUSHClient package, and output a file you can read into tintin
+with "#MAP READ", effectively converting your mushclient's map to a tintin
+map to ease your transition and prevent having to reexplore the world to
+build your map from scratch.
+
+Both paths may be given as relative, and the path given as an output file
+name will be (over)written.
+
+Custom exits are preserved, portable portals are not. You'll have to add them
+manually to paths.tin if you haven't already.
+
+