Add "MEC Federation"

[vielmetti]

We have a new definition that needs to be added to the Open Glossary for Edge Computing. It’s for MEC Federation. Can you help us get it added please?

“MEC federation: federated model of MEC systems enabling shared usage of MEC services and applications. In this model different stakeholders collaborate for joint business purposes, and "federate" their edge computing resources, by offering/exposing their MEC service capabilities, not only for mutual consumption, but also offering those to application developers and end customers (e.g. vertical market segments).”

via Yevgeniy Sverdlik