added github action badge

Author: irockel

README.md

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-# TDA - Thread Dump Analyzer
 [![Java CI with Maven](https://github.com/irockel/tda/actions/workflows/build.yml/badge.svg)](https://github.com/irockel/tda/actions/workflows/build.yml)
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+# TDA - Thread Dump Analyzer
 TDA (Thread Dump Analyzer) for Java is a powerful yet lightweight Swing GUI for analyzing Thread Dumps and Heap 
 Information generated by the Java VM. It is designed to assist in diagnosing performance issues, deadlocks, and 
 memory problems in Java applications.