add method to retrieve the current connection name
add a get database name method
Revert "add a get database name method"

This reverts commit 4705f56d5f5a4a272ed616341e5998c1c2be0e98.
add a get database name method
add connection and database name to prompt
add method to check if a connection exists
inject config into database connection
add change database command
improve readme
sort list of commands in help