Adding build badge

README.md

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 # Task Execution Framework
 
+[![Java CI with Maven](https://github.com/flipkart-incubator/tef/actions/workflows/maven.yml/badge.svg)](https://github.com/flipkart-incubator/tef/actions/workflows/maven.yml)
+
 A low-footprint Workflow Execution Framework to build and execute configured DAGs. 
 
 The highlights of this framework is its ability to configure within code, with the support for Data and Control Dependencies along with packaging logical blocks as Capabilities.
 
 ## Lead Developer
-@bageshwar
+@bageshwar