Update README.md

You need to submit the DB2INST job.

Author: JAMOGRAD

etc/install/base/doc/README.md

@@ -210,6 +210,8 @@ The VCAT value for the storage groups must be changed to match your installation
 files and populate the Db2 tables with
 data.](#create-the-vsam-files-and-populate-the-db2-tables-with-data)).
 
+Submit job **INSTDB2** to create the necessary Db2 artefacts.
+
 ##
 
 ## Compile/assemble, linkedit and bind the source code modules and BMS maps.