First commit. Add top makefile.
Makefile+patches to build z88dk, iDSK and a hello world for Amstrad CPC.

This is an embryo. From your local copy, a simple "make" should fetch
source code and build :

* z88dk toolchain including zcc emulator and create a build_config.inc
  to source for easy use

* iDSK tool to manipulate Amstrad CPC 3" disk image file.

* a hello world using both tools above.

You should be able to run the hello world like this :

* launch an emulator, telling it to put a.dsk in first disk drive

* inside emulated CPC type :

memory &5fff
load "a.bin
call &6000

CPC should show :

Hello world !
Added README.md reflecting the change of aim of this repository: separate toolchain from project.
Merged README, updated .gitignore.