Nickmccleery/add contributor field to research (#554)

* Simplicity >>>>

* Add Serena here, why not.

Author: nickmccleery

content/research/zoo-cad-engine-overview.mdx

@@ -8,6 +8,7 @@ date: '2025-05-20T01:00:00.000Z'
 author:
     name: Mike Farrell & Alyn Rockwood
     picture: ''
+additionalContributors: 'Serena Gandhi'
 ogImage:
     url: 'documentation-assets/meta-images/zoo-research-geometry-engine.jpg'
 ---

contentlayer.config.js

@@ -244,6 +244,12 @@ const ResearchPage = defineDocumentType(() => ({
             description: 'The author of the research page.',
             required: true,
         },
+        additionalContributors: {
+            type: 'string',
+            description:
+                'Additional contributors to the research page, for attribution purposes.',
+            required: false,
+        },
         ogImage: {
             type: 'nested',
             of: OgImage,