init for chats and api

stubs/api/chat/index.js

@@ -0,0 +1,17 @@
+const chatRouter = require('express').Router();
+
+module.exports = chatRouter;
+
+const { users, chats, getUserFromDB, getChatFromDB } = require('../db');
+
+chatRouter.get('/:id1/:id2', (req, res) => {
+    const { id1, id2 } = req.params;
+
+    const chat = getChatFromDB(id1, id2);
+
+    if (chat) {
+        res.status(200).send({chat});
+    } else {
+        res.status(404).send({message: 'Chat was not found'});
+    }
+})