Add new pattern to overview

Author: spier

Diff for: README.md

@@ -85,6 +85,7 @@ Our mission
 * [InnerSource Customer Interview Questions](/patterns/1-initial/innersource-customer-interview-questions.md) - *An organization has decided to create an InnerSource program but are unsure which issues they should address first. Using a customer interview will help evaluate pain points across the organization, to prioritize the areas where InnerSource will have the biggest positive impact.*
 * [Creating an InnerSource Strategy](/patterns/1-initial/creating_an_innersource_strategy.md) - *Sometimes, it is difficult to convince people of the relevance of InnerSource for your organization and/or to get support from management. Creating an InnerSource strategy, that connects your InnerSource approach and activities to the goals and the overall strategy of your organization, can help in this regard.*
 * [Code of Conduct](/patterns/1-initial/code-of-conduct.md) - *Communications and interactions between collaborators are rude, not inclusive or offensive, harming and increasing the discussions without any value added. A Code of Conduct provides guidelines for establishing rules and expectations regarding behavior and interactions within the community to build stronger levels of collaboration.*
+* [Trusted Committer and Contributor Retrospectives](/patterns/1-initial/cross-team-retrospectives.md) - *A host team working with contributors outside of their own line of management constantly runs into misunderstandings. As a result collaboration becomes brittle and frustrating. Setting aside time for regular retrospectives for the InnerSource team consisting of trusted committers and contributors can help make communication smooth.*
 
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 NOTE: The 'Initial' Patterns below don't have a Patlet yet, which is essential for readers to quickly browse our patterns.