Created pattern placeholder

Added placeholder for pattern "Cross Team Valuation", which is currently under development in a PR.

Author: gruetter

cross-team-valuation.md

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+# Title
+
+Cross Team Valuation
+
+# Patlet
+
+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.
+
+**This pattern is currently [under development in a Pull Request](https://github.com/paypal/InnerSourcePatterns/pull/87)**