Subject (#5207)

Adds "The Zebra" to adopters list

Signed-off-by: Cole <cpackingham@thezebra.com>

ADOPTERS.md

@@ -33,6 +33,7 @@
 - [Purdue University Global](https://www.purdueglobal.edu/)
 - [Studyo](https://studyo.co)
 - [Sue](https://sue.nl)
+- [The Zebra](https://www.thezebra.com)
 - [Transit](https://transit.app)
 - [Vernacular.ai](https://vernacular.ai/)
 - [xCloud](https://www.xbox.com/en-US/xbox-game-streaming/project-xcloud)