Create Differentiator-Clusters.md

[sdenter]

creating the new section differentiator cluster

[Isengo1989]

Hey @sdenter - just following up on the draft. Can you give a little more input on what it is about (gladly via teams as well) and/or if this is still needed. (Draft is from a month ago)

[bojanrajh]

Closed in favour of https://github.com/shopware/docs/pull/1446