Log Message:
Initial import of Jochen Kunz's documentation for writing device drivers
for NetBSD (written in German) into the NetBSD Packages Collection.

A "NetBSD Device Driver Writing Guide":

It consists of three main sections:

- Introduction to autoconfig(8).
- Usage of the autoconfig(8) infrastructure, demonstrated on the example
  of rf(4).
- Core of the rf(4) driver, that shows how data is transfered from and
  to a (disk) device.