Add a simple README

diff --git a/filter/censor/README.txt b/filter/censor/README.txt
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+//////////////////////////
+//                      //
+//  Censorship Filter   //
+//                      //
+//////////////////////////
+
+This is a very simple Text Filter that searches text 
+being output to the screen, replacing "bad" words 
+with other words.
+
+To activate this filter, add a line like this to your
+config.php:
+
+   $CFG->textfilter1 = 'filter/censor/censor.php';
+
+
+To customise the word list, edit cursor.php.