Added construct to build tools (#621)

README.md

 
 * [Bob](https://github.com/CHH/bob) - A simple project automation tool.
 * [Box](https://github.com/box-project/box2) - A utility to build PHAR files.
+* [Construct](https://github.com/jonathantorres/construct) - A PHP project/micro-package generator.
 * [Phake](https://github.com/jaz303/phake) - A rake PHP clone library.
 * [Phing](https://www.phing.info/) - A PHP project build system inspired by Apache Ant.