Added file for listing commercial users
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+# Commercial users of Catch
+
+As well as [Open Source](opensource-users.md) users Catch is widely used within proprietary code bases too. Many companies like to keep this
+information internal, and that's fine, but if you're more open it would be great if we could list the names of as
+many organisations as possible that use Catch somewhere in their codebase. Enterprise environments often tend to be
+far more conservative in their tool adoption - and being aware that other companies are using Catch can ease the
+path in.
+
+So if you are aware of Catch usage in your organisation, and are fairly confident there is no issue with sharing this
+fact then please let us know - either directly, via a PR or [issue](https://github.com/philsquared/Catch/issues), or on the [forums](https://groups.google.com/forum/?fromgroups#!forum/catch-forum).
+
+ - Bloomberg