feat: add link to gqm usage

feat: add mermaid graph

Author: jeffabailey

SUMMARY.md

@@ -30,3 +30,4 @@
     * [Allow Innovation in Detail](measuring/metrics.md#allow-innovation-in-detail)
   * [References](measuring/references.md)
   * [Authors and Reviewers](measuring/authors.md)
+* [Use Goals, Questions, and Metrics](measuring/use_gqm.md)

measuring/use_gqm.md

@@ -0,0 +1,12 @@
+Use Goals Questions, and Metrics
+=============================
+
+```mermaid
+graph LR
+    reduce-duplication[Reduce Duplication] --> who-uses[Who Uses]
+
+    click reduce-duplication "./goals/reduce-duplication.md" "We can see how many times an InnerSource project is reused.  If there is extra information attached to that usage (like which business unit is the user) then we can see how widely across the company an InnerSource project is used."
+    
+    who-uses --> usage-count[Usage Count]
+    usage-count --> reduce-duplication[Reduce Duplication]
+```