Add build badge

Author: Bassem Dghaidi

README.md

@@ -1,5 +1,14 @@
 # Objectron
 
+| build | ![Node.js CI](https://github.com/mena-devs/objectron/workflows/Node.js%20CI/badge.svg?branch=master) |
+|-------|------------------------------------------------------------------------------------------------------|
+
+- [Objectron](#objectron)
+  - [Synopsis](#synopsis)
+  - [Install](#install)
+  - [Usage](#usage)
+  - [Collaborators](#collaborators)
+
 ## Synopsis
 
 TBD