Add Crux to USERS.md

Summary: Pull Request resolved: facebook#5718 Differential Revision: D17096939 Pulled By: riversand963 fbshipit-source-id: 4301078d3ca3d54a1c7e841eccad95379cd1570d
mahak · Aug 29, 2019 · c5e12eb · c5e12eb
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@@ -96,3 +96,6 @@ LzLabs is using RocksDB as a storage engine in their multi-database distributed
 
 ## IOTA Foundation
  [IOTA Foundation](https://www.iota.org/) is using RocksDB in the [IOTA Reference Implementation (IRI)](https://github.com/iotaledger/iri) to store the local state of the Tangle. The Tangle is the first open-source distributed ledger powering the future of the Internet of Things.
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+## Crux
+[Crux](https://github.com/juxt/crux) is a document database that uses RocksDB for local [EAV](https://en.wikipedia.org/wiki/Entity%E2%80%93attribute%E2%80%93value_model) index storage to enable point-in-time bitemporal Datalog queries. The "unbundled" architecture uses Kafka to provide horizontal scalability.