Update README.md

Added Cross Team Project Valuation to the README index (under not-fully-reviewed but proven)

Author: NewMexicoKid

README.md

@@ -24,6 +24,7 @@ possible to either deploy the same service in independent environments with sepa
 #### Pattern Drafts (proven, not yet fully reviewed)
 
 * [Assisted Compliance](https://github.com/paypal/InnerSourcePatterns/pull/74) - *Helping repo owners be compliant by writing their CONTRIBUTING.md for them as a pull request.*
+* [Cross-Team Project Valuation](https://github.com/paypal/InnerSourcePatterns/blob/master/crossteam-project-valuation.md) - *It's hard to sell the value of cross-team, inner sourced projects that don't provide a direct impact on company revenue. Here's a data-driven way to represent your project that both articulates its value and amplifies it.*
 * [Reluctance to Receive Contributions](https://docs.google.com/document/d/13QDN-BpE_BixRFVGjao32n4Ctim0ROXAHbBWMBOijb4/edit) - *Core owner of shared asset is reluctant to take contributions due to the required maintenance that comes with them.*
 * [What Before How or Services Documentation](https://docs.google.com/document/d/1_N1wsQeDusfIcNy-O2ZXenY3PL7ZbvkUDRZxGUuegZw/edit?usp=drive_web) - *A lack of common understanding between different management tiers creates funding barriers and increases the risk that solutions will not deliver required business outcomes.*
 * [Overcome Acquisition Based Silos - Developers](https://github.com/paypal/InnerSourceCommons/wiki/Overcome-Acquisition-based-Silos)