Add Quick Reference Table for Users (#840)
Add Quick Reference Table for Users (#840)

* Allows at a glance for prospective users to know our current status.

Signed-off-by: Harold Dost <430dd398376ddbbc223657d142ebbcfb26935851@criteo.com>
open-telemetry/opentelemetry-rust,open-telemetry/opentelemetry-rust