Linux readme file

[Rubén Rodríguez]

The user lluvia at #trisquel just pointed me to the README file in the
linux tree. It contains this description:

  WHAT IS LINUX?
  
  Linux is a clone of the operating system Unix, written from scratch by
  Linus Torvalds with assistance from a loosely-knit team of hackers
  across the Net. It aims towards POSIX and Single UNIX Specification
  compliance.

I think the deblobber should replace the README with something better,
describing what linux-libre and GNU are.