Adding tristanpoland, patzeltj, and mafolz as reviewers for Stratos Project

Adding users
  Tristan Poland of FiveTwenty
  Jan Lucca Patzelt of STACKIT
  Matthias Folz of anynines
as reviewers for the project.

Rebase to main

Author: krutten

toc/working-groups/app-runtime-interfaces.md

@@ -386,6 +386,12 @@ areas:
     github: xiujiao
   - name: Dennis Bell
     github: dennisjbell
+  - name: Tristan Poland
+    github: tristanpoland
+  - name: Jan Lucca Patzelt
+    github: patzeltj
+  - name: Matthias Folz
+    github: mafolz
 
   repositories:
   - cloudfoundry/stratos