add comment function

src-ui/src/app/data/paperless-document-comment.ts

@@ -0,0 +1,8 @@
+import { ObjectWithId } from './object-with-id'
+import { CommentUser } from './user-type'
+
+export interface PaperlessDocumentComment extends ObjectWithId {
+    created?: Date
+    comment?: string
+    user?: CommentUser
+}