Add rundown to readme

README.md

@@ -1,5 +1,13 @@
 # gockle
 
-[![Go Reference](https://pkg.go.dev/badge/github.com/willfaught/gockle.svg)](https://pkg.go.dev/github.com/willfaught/gockle)
+Package gockle simplifies and mocks github.com/gocql/gocql. It provides simple interfaces to insert, query, and mutate Cassandra data, as well as get basic keyspace and table metadata.
 
-*Note: Test coverage is low because there is no Cassandra database for the tests to use. Providing one yields 97.37% test coverage. Some code is uncovered because gocql cannot be mocked. This is one difficulty your code avoids by using gockle.*
+The entry points are NewSession and NewSimpleSession. Call them to get a Session. Session interacts with the database. It executes queries and batched queries and iterates result rows. Closing the Session closes the underlying gocql.Session, including the one passed to NewSimpleSession.
+
+Mocks are provided for testing use of Batch, Iterator, and Session.
+
+Tx is short for transaction.
+
+The name gockle comes from a pronunciation of gocql.
+
+Note: Test coverage is low because there is no Cassandra database for the tests to use. Providing one yields 97.37% test coverage. Some code is uncovered because gocql cannot be mocked. This is one difficulty your code avoids by using gockle.