add license.md for rCharts and add section in Readme.md

License.md

@@ -0,0 +1,3 @@
+## License
+
+rCharts is licensed under the MIT License. However, the JavaScript charting libraries that are included with this package are licensed under their own terms. All of them are free for non-commercial use, but some of them are not free for commercial use. So please make sure to check the licensing terms of the charting library you are working with, before using them commercially.  Each of the charting libraries contains a License.md file detailing the terms of their license.

README.md

@@ -219,7 +219,7 @@ Most of the implementation in `rCharts` is inspired by [rHighcharts](https://git
 
 ### License
 
-`rCharts` is licensed under the MIT License. However, the Polycharts JavaScript library that is included in this package is not free for commercial use, and is licensed under Creative Commons 3.0 Attribution & Non-commercial. Read more about its license at http://polychart.com/js/license.
+rCharts is licensed under the MIT License. However, the JavaScript charting libraries that are included with this package are licensed under their own terms. All of them are free for non-commercial use, but some of them are not free for commercial use. So please make sure to check the licensing terms of the charting library you are working with, before using them commercially.  Each of the charting libraries contains a `License.md` file detailing the terms of their license.
 
 ### See Also