Add company

Author: puredanger

content/community/companies.adoc

@@ -201,6 +201,7 @@ Also, check out the <<success_stories#,Clojure Success Stories>> and <<community
 * http://www.passivsystems.com/[PassivSystems]
 * http://path.com/[Path]
 * http://paygarden.com[PayGarden]
+* https://www.payoff.com/[Payoff]
 * http://www.pennymacusa.com[PennyMac]
 * http://www.pivotal.io/[Pivotal Labs]
 * http://www.pointslope.com[Point Slope]