message: Adds License to README.md
diff: @@ -141,5 +141,5 @@ expand radeco's arsenal.
  please file a bug report on this repository.
  ## License
  -
  -(TODO)
  +Licensed under The BSD 3-Clause License. Please check [COPYING](https://github.com/radare/radeco/blob/master/COPYING) file for
  +complete license.
  