Create who-uses.md

Author: rrrutledge

measuring/questions/who-uses.md

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+# Who uses the InnerSource project?
+
+Depending on the InnerSource project, usage could look something like:
+
+* Inclusion of a module in a build.
+* Calling and API.
+* Visiting a UI.
+
+## Goals
+
+* [Reduce duplication](../goals/reduce-duplication.md)
+
+## Metrics
+
+* [Example Metric](./gqm_example_metric.md)