Create README.md

Author: Nicolas Marien

README.md

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+# Usage
+
+- update the uglifyjs library :arrow_right: `yarn update-uglify` (in resources directory)
+- extract the uglifyjs javascript file :arrow_right: `yarn extract-script` (in resources directory)
+- build the jar :arrow_right: `mvn package`
+
+`java -jar nashorn-uglifyjs.jar input.js output.min.js`
+
+# Credits
+
+- [the great UglifyJS2](https://github.com/mishoo/UglifyJS2)