Added bulk json insert test

Rest.http

@@ -68,6 +68,24 @@ Content-Type: application/json
 }
 ?? status == 201
 
+###
+POST /products
+Content-Type: application/json
+
+[
+  {
+    "product_name": "Saffaron"
+  },
+  {
+    "product_name": "Chai"
+  },
+  {
+    "product_name": "sar"
+  }
+]
+
+?? status == 201
+
 ###
 {{
     const axios = require('axios');