[INTERNAL] Add travis CI badge

Author: RandomByte

README.md

@@ -4,6 +4,8 @@
 > Modules for building UI5 projects  
 > Part of the [UI5 Build and Development Tooling](https://github.com/SAP/ui5-tooling)
 
+[![Travis CI Build Status](https://travis-ci.org/SAP/ui5-builder.svg?branch=master)](https://travis-ci.org/SAP/ui5-builder)
+
 **This is a Pre-Alpha release!**  
 **The UI5 Build and Development Tooling described here is not intended for productive use yet. Breaking changes are to be expected.**