document Raspberry Pi setup

[david415]

we should document a quick Raspberry Pi2 setup with arm Debian Jessie running HoneyBadger.

• apt-get install libpcap-dev ethtool
• golang 1.5.x can be installed via jessie-backports; apt-get install -t jessie-backports golang;
• setup golang env in .bashrc
• go get github.com/david415/HoneyBadger/cmd/honeyBadger
• sudo setcap ...
• configure debian /etc/network/interfaces + hostapd configuration
• run hostapd and run honeybadger

[DrWhax]

Sounds like we need some Ansible magic :-)