Update README.md with build status badge

Author: rahlk

README.md

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 ![logo](./docs/assets/logo.png)
 
 Native WALA implementation of source code analysis tool for Enterprise Java Applications.
 
+![example workflow](https://github.com/IBM/codenet-minerva-code-analyzer/actions/workflows/main.yml/badge.svg)
 ## 1. Prerequisites
 
 Before you begin, ensure you have met the following requirements: