add architecture diagram

Author: data-henrik

README.md

@@ -5,6 +5,8 @@ This tutorial shows how to provision a SQL (relational) database service, create
 
 This tutorial is part of [IBM Cloud tutorials](https://cloud.ibm.com/docs/tutorials?topic=solution-tutorials-tutorials) and discussed as [SQL Database for Cloud Data](https://cloud.ibm.com/docs/solution-tutorials?topic=solution-tutorials-sql-database).
 
+![architecture diagram](images/cloud-sql-database.svg)
+
 # Up and running in few steps
 To get this SQL database-backed app up and running only few steps and about 10 minutes are needed. Please follow the steps outlined in the IBM Cloud tutorial.