[ADF-1586] Added Core services docs (#2587)

docs/comment-process.model.md

@@ -0,0 +1,27 @@
+# Comment Process model
+
+Represents a comment added to a Process Services task or process instance.
+
+## Details
+
+Instances of this class are returned by the methods of the
+[Comment Process service](comment-process.service.md). See the Comments API
+methods in the
+[Alfresco JS API docs](https://github.com/Alfresco/alfresco-js-api/tree/master/src/alfresco-activiti-rest-api)
+for more information.
+
+```ts
+class CommentProcessModel implements CommentRepresentation {
+    id: number;
+    message: string;
+    created: Date;
+    createdBy: LightUserRepresentation;
+}
+```
+
+<!-- Don't edit the See also section. Edit seeAlsoGraph.json and run config/generateSeeAlso.js -->
+<!-- seealso start -->
+## See also
+
+- [Comment process service](comment-process.service.md)
+<!-- seealso end -->