adding route for the getting of conversation details

packages/core/models/content.model.ts

@@ -0,0 +1,19 @@
+import { ObjectId } from "mongodb";
+
+export default class Content {
+  constructor(
+    public relationshipId: string, // if it's a one on one, this will be the relationship Id
+    public sentDate: Date,
+    public contentUrl: string,
+    public contentData: string,
+    public contentType: ContentType,
+    public _id?: ObjectId,
+    public listenedDate?: Date
+  ) {}
+}
+
+export enum ContentType {
+  link = "LINK",
+  audioClip = "AUDIO_CLIP",
+  text = "TEXT",
+}