Add metadata example

WebsiteGenerator/Content/GenericMetadata.swift

@@ -172,3 +172,23 @@ extension GenericMetadata {
         }
     }
 }
+
+extension GenericMetadata {
+
+    static var full: GenericMetadata {
+        .init(
+            author: "",
+            topBarTitle: "",
+            date: "",
+            endDate: "",
+            state: "",
+            sortIndex: 1,
+            externalFiles: [],
+            requiredFiles: [],
+            thumbnailStyle: "",
+            useManualSorting: false,
+            overviewItemCount: 6,
+            useCustomHeader: false,
+            languages: [.full])
+    }
+}