Add README.txt

Author: twistor

README.txt

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+Allows to have an exposed filter only show options that belong to result set.
+
+To make it work:
+
+[1] Enable the module.
+[3] Add a field to the view that you want to use as a distinct field.
+[3.2] Configure the field output in [3] as you wish.
+[3.3] If you do not want this field to be shown in the result set,
+just mark it as "Hide From Display".
+[2] Add a filter of type "selective" to your view, and in the filter settings
+select the field you configured in [3]. If the field is not showing, that means
+that the filter and field you are trying to match are not compatible.
+
+You can get 3 types of errors with this module:
+
+(a) You did not properly match a filter and a field.
+(b) You properly matched filter and field, but base field is not the same.
+You get the same error text as in (a).
+(c) You choose a field whose distinct value has more than the limit (100 by default) 
+different possible values, obviously this field is not the kind of field you 
+would use for a selective filter.