First pass at NetBSD info page from Riastradh

NetBSD.mdwn

+NetBSD has preliminary support for NVIDIA hardware via the `nouveau(4)`
+DRM/KMS kernel driver ported from Linux 3.15, and all the same userland
+components as for Linux -- the `libdrm` library, the `libdrm_nouveau`
+library, the `xf86-video-nouveau` X.org video driver, and the Mesa
+`nouveau_dri.so` GL driver.
+
+On NetBSD 7, the kernel driver `nouveau(4)` is available on i386 and
+amd64, but disabled by default.  Most bug fixes are pulled up to the
+netbsd-7 branch,   The userland components are not
+available in the standard distribution sets, though they are available
+through pkgsrc in x11/xf86-video-nouveau and graphics/MesaLib.
+
+On NetBSD-current, the kernel driver `nouveau(4)` is enabled by default
+in the `i386/GENERIC`, `amd64/GENERIC`, and `evbarm/TEGRA` kernel
+configurations.  The userland components are available in the
+distribution sets, spread across `xbase.tgz`, `xcomp.tgz`, `xserver.tgz`, and
+`xdebug.tgz`, or from pkgsrc in `x11/xf86-video-nouveau` and
+`graphics/MesaLib`.
+
+Some hardware has been tested, but I don't have a list of it at the
+moment.  If the display blanks or otherwise fails when you try to boot
+with NVIDIA graphics hardware, you can disable `nouveau(4)` at the boot
+prompt by booting with `boot -c` and then typing `disable nouveau` and
+`quit` at the following userconf prompt:
+
+    > boot -c
+    userconf> disable nouveau
+    userconf> quit
+    ...