Update README [skip-ci]

Author: MarkNjunge

README.md

@@ -8,10 +8,12 @@
 # JustJava
 [![Build Status](https://app.bitrise.io/app/c373b1aa540acc1c/status.svg?token=u-KpJIBnS_0TQUtBtYNEJQ&branch=master)](https://app.bitrise.io/app/c373b1aa540acc1c)
 [![Playstore](https://img.shields.io/badge/Download-Playstore-brightgreen.svg)](https://play.google.com/store/apps/details?id=com.marknkamau.justjava)
-[![latest build](https://img.shields.io/badge/Download-Latest%20build-brightgreen.svg)](https://skyll.marknjunge.com/justjava?redirect=true)  
+[![latest build](https://img.shields.io/badge/Download-Latest%20build-brightgreen.svg)](https://barbet.marknjunge.com/justjava)
 
 A sample food delivery application for a coffee shop.
 
+The backend API is written using Nest.js. See [justjava-api](https://github.com/MarkNjunge/justjava-api).
+
 ## Features
 
 - 100% Kotlin.