docs(README.md): add CI status badge to indicate the current build status of the project

Author: suryaelidanto

README.md

@@ -1,5 +1,6 @@
 # Structured Data Extractor
 
+![CI Status](https://github.com/suryaelidanto/structured-data-extractor/actions/workflows/ci.yml/badge.svg)
 ![Python Version](https://img.shields.io/badge/python-3.10%2B-blue)
 ![License](https://img.shields.io/badge/license-MIT-green)