added a short example to README.txt

README.txt

@@ -1,2 +1,27 @@
 This is the attempt to implement a driver for MongoDB
 (http://www.mongodb.org) in Factor (http://www.factorcode.org).
+
+Usage example (for a quick overview):
+
+USE: mongodb.driver
+
+! 1. initialize mdb
+! database host port <mdb>
+"db" "127.0.0.1" 27017 <mdb>
+
+! 2. create an index
+! <mdb> [ collection name spec ensure-index ] with-db
+dup [ "test" "idIdx" H{ { "_id" 1 } } ensure-index ] with-db
+
+! 3. insert an object
+! <mdb> [ collection object save ] with-db
+dup [ "test" H{ { "_id" "12345" } { "name" "myobject" } } save ] with-db
+
+! 4. find the object
+! <mdb> [ collection example <query> ..options.. find ] with-db
+dup [ "test" H{ { "_id" "12345" } } <query> find ] with-db
+
+! a find with options would look like this
+
+dup [ "test" H{ { "name" "myobject" } } <query> 10 limit 
+      [ "_id" asc "name" desc ] sort find ] with-db