Update README.md

Author: pberlandier

README.md

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-# <img src="./book/docs/images/denim-compute.png" width="90"/>Denim Compute - a Digital Business Automation reference implementation on the IBM Cloud Pak for Automation
+# <img src="./book/docs/images/denim-compute.png" width="90"/>Denim Compute
 
+<b>A Digital Business Automation reference implementation on the IBM Cloud Pak for Automation</b>
 This reference implementation uses the IBM Cloud Pak for Automation to exemplify how the different capabilities of the IBM Digital Business Automation platform come together on a container-centric management environment to support the execution of a complex business process. 
 
 You will find the details about the environment, architecture, design and implementation of this end-to-end use case in the [documentation pages](https://ibm-cloud-architecture.github.io/denim-compute/).