Adding Unified Source Code Inventory pattern to the overview (README) (#323)

Author: spier

README.md

@@ -66,6 +66,7 @@ The below lists all known patterns. They are grouped into three [maturity levels
 * [Contained InnerSource](patterns/1-initial/contained-innersource.md) - *Apply InnerSource methods to facilitate collaboration in a cross-divisional project but don't invest in soliciting contributions from outside of that project.*
 * [Good First Project](patterns/1-initial/good-first-project.md) - *An InnerSource program has been launched at an organization, and to get off to a successful start it requires some good first projects that lend themselves to InnerSource-style development. Assessing the InnerSource-readiness (fitness) of the candidate projects can help in selecting projects that have the potential to help demonstrate the power of InnerSource.*
 * [InnerSource Guidance Group](patterns/1-initial/innersource-guidance-group.md) - *A highly divergent set of development standards in different teams can slow down collaboration betweens these teams. A InnerSource Guidance Group that establishes broad governance and behavioral guidelines can help to reduce these frictions.*
+* [Unified Source Code Inventory](patterns/1-initial/source-code-inventory.md) - *In a large organization with different legal entities is often hard to get full visibility into all software assets, in particular all source code. This situation reduces the opportunities to increase business value and keep liability costs, such as software maintenance, under control across the organization as a whole. An organization-level source code inventory addresses these issues while exploiting opportunities to identify and support valuable InnerSource assets.*
 * [Overcome Acquisition Based Silos - Developers](patterns/1-initial/overcome-acquisition-based-silos-developer.md)
 * [Overcome Acquisition Based Silos - Managers](patterns/1-initial/overcome-acquisition-based-silos-manager.md)
 * [Discover Your InnerSource](patterns/1-initial/discover-your-innersource.md)