Update umbraco-marketplace.json

Author: rickbutterfield

umbraco-marketplace.json

@@ -2,10 +2,20 @@
   "$schema": "https://marketplace.umbraco.com/umbraco-marketplace-schema.json",
   "AuthorDetails": {
     "Name": "Umbraco Sustainability Community Team",
-    "ImageUrl": "https://github.com/rickbutterfield.png"
+    "ImageUrl": "https://github.com/rickbutterfield.png",
+    "Contributors": [
+      {
+        "Name": "Rick Butterfield",
+        "Url": "https://github.com/rickbutterfield"
+      },
+      {
+        "Name": "Thomas Morris",
+        "Url": "http://github.com/tcmorris"
+      }
+    ]
   },
   "Category": "Editor Tools",
-  "Description": "Sustainability extensions for Umbraco.",
+  "Description": "A package from the Umbraco Community Sustainability Team which helps developers and editors see and improve the carbon impact of their websites.",
   "LicenseTypes": [ "Free" ],
   "IssueTrackerUrl": "https://github.com/rickbutterfield/Umbraco.Community.Sustainability/issues",
   "PackageType": "Package",
@@ -24,4 +34,4 @@
     "sustainability"
   ],
   "Title": "Umbraco.Community.Sustainability"
-}
+}