message: docs: Add REDCap Cloud to superset users
diff: @@ -143,6 +143,7 @@ Join our growing community!
  - [Living Goods](https://www.livinggoods.org) [@chelule]
  - [Maieutical Labs](https://maieuticallabs.it) [@xrmx]
  - [QPID Health](http://www.qpidhealth.com/)
  +- [REDCap Cloud](https://www.redcapcloud.com/)
  - [TrustMedis](https://trustmedis.com) [@famasya]
  - [WeSure](https://www.wesure.cn/)
  