JS: Add test that calls .json or .jsonp

Author: asgerf

javascript/ql/test/library-tests/frameworks/Express/src/json.js

@@ -0,0 +1,10 @@
+const express = require('express');
+const app = express();
+
+app.get('/test/json', function(req, res) {
+    res.json(req.query.data);
+});
+
+app.get('/test/jsonp', function(req, res) {
+    res.jsonp(req.query.data);
+});