add introductory text

[KwokCrystal]

Changes Made

• Add introductory text to certified technology provider page

[sseppi]

@KwokCrystal the request has been merged. In a few minutes you can see the changes on testig.

If you need to share the information with someone, tha changes will be applied at the following link: https://opendatahub.testingmachine.eu/services/certification/