Add Swisscom as a Strimzi adopter (strimzi#3612)

Signed-off-by: Quentin Barrand <[email protected]>

Author: qbarrand

ADOPTERS.md

@@ -10,6 +10,7 @@
 * [Red Hat](https://www.redhat.com/en/)
     * [AMQ Streams](https://www.redhat.com/en/resources/amq-streams-datasheet)
 * [SBB CFF FFS](https://www.sbb.ch/en/home.html)
+* [Swisscom](https://www.swisscom.ch/)
 
 Are you currently using Strimzi in production?
 Please let us know by adding your company name and, if you want, a description of your use case to this document!