Added readme

README

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+About
+=====
+
+pyramid_mongo is intended for use with the default python driver for mongodb
+
+How to use
+==========
+
+You have to define at least 3 things in your settings
+
+    mongo.uri = uri of your database (mongodb://localhost/)
+    mondo.db = name of the database you want to use
+
+Those two are optional
+
+    mongo.username = username for authentication to the db
+    mongo.password = password used for authentication to the db