first version of README.md
Some bit of documentation
First bootable version, updated netkit-core required.

- modules are now copied in the fs
   - modules are copied in the fs build directory to be accessible in rootstrap
   - removing module loading from init.d
   - copy modules configured in rootstrap
- netkit-filesystem-version is copied in the fs
- tar.gz of the fs is now sparse aware
- removing dsniff from packages-list (X11 dependencies)