Add Intesys to the company list

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• Add Intesys (intesys.it) to company list

Company website: https://www.intesys.it

About our support to open source projects:

• Open hospital
  • https://github.com/informatici/openhospital-ui;
  • https://github.com/intesys/openhospital-core;
  • https://github.com/intesys/openhospital-api
• More about ongoing OS projects: https://github.com/intesys