chore: add Marketing WORKING_GROUP

WORKING_GROUPS.yaml

@@ -12,6 +12,14 @@ working_groups:
   #   okrs_url: https://example.com/xyz # Required. Link to a GitHub project, issue, or any other tool where the Working Group explains their objectives.
   #   roadmap_url: https://example.com/xyz # Recommended. Link to a GitHub project, issue, or any other tool where the Working Group outlines their roadmap.
   #   github_team: # Recommended. The GitHub team handle to tag all the working group members at once. Example: @asyncapi/community_growth_wg.
+
+  - name: Marketing  
+    description: The Marketing Working Group aims to ensure AsyncAPI marketing growth is healthy and sustainable.  
+    chairperson: tbd 
+    members:
+      - @derberg
+      - @thulieblack
+      - @Mayaleeeee
   - name: Developer Experience
     description: The goal of this group is to empower AsyncAPI user journey trough intuitive onboarding, tools, and a frictionless experience.
     chairperson: @Amzani