Add BBVA as known instance to Core Team pattern (#523)

Author: rahermur

patterns/2-structured/core-team.md

@@ -97,6 +97,7 @@ The core team fills those gaps and greases the wheels so that the contribution e
 
 * **Nike** implemented this pattern to manage the InnerSource effort around its reusable CI/CD pipelines.
 * **WellSky** established a Core Team for a key project. This allowed them to scale their InnerSource contributions to that project significantly - see [Wide-Scaled InnerSource with a Core Team](https://www.youtube.com/watch?v=kgxexjYdhIc).
+* **BBVA AI Factory** implemented this pattern as part of an InnerSource strategy to foster contribution to and reuse of data science code - see [Mercury: Scaling Data Science reusability at BBVA](https://www.bbvaaifactory.com/mercury-acelerando-la-reutilizacion-en-ciencia-de-datos-dentro-de-bbva/).
 
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