Adding link to new pattern innersource-hackathon.md to README

Author: spier

README.md

@@ -86,6 +86,7 @@ Our mission
 * [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.*
+* [InnerSource Hackathon](/patterns/1-initial/innersource-hackathon.md) - *In a company, initially only InnerSource enthusiasts are interested and practicing InnerSource during the early stages of InnerSource adoption; not all engineering teams are willing or have enough time and resources to adopt InnerSource. In this scenario, it is good to provide a safe space to try and adopt InnerSource through an InnerSource Hackathon event within the company.*
 
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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.