Add licencing and source code information for busybox binary

[sysvinit]

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The first-boot configuration script used in PiBakery v2 (which I co-wrote with @davidferguson) uses a statically linked busybox executable to install PiBakery files onto the Raspbian root partition. The busybox executable at resources/busybox file has been copied verbatim from a Raspbian system, however busybox is licenced under GPLv2 -- this means that any binary distribution must be accompanied with source code (upon request). Bundling this binary with PiBakery counts as redistribution, and currently there is no information on how to get source code for this binary, which could potentially lead to a GPL violation.

If I recall correctly, the busybox binary in the repository has been copied from /bin/busybox on a Raspbian system with the busybox-static package installed. This issue could be solved by stating as such in a legal notice in the repository (including busybox's copyright and licencing information), and linking to the source package for the busybox-static package in Raspbian.

[lurch]

Closed by #169 ?