Add License file

- Copy https://github.com/crosswalk-project/crosswalk/blob/master/LICENSE
- s/2013/2014/ as this project started this year
- This file is referenced by README.md
Refine README file
Merge pull request #2 from zqzhang/zqzhang/readme

Refine README file
Merge pull request #1 from zqzhang/zqzhang/license

Add License file