doc(gov): add GOVERNANCE.md
doc(gov): add GOVERNANCE.md

PR-URL: #54

Related: nodejs/docker-iojs#65
Signed-off-by: Hans Kristian Flaatten <c55dee379130c24fd338eadd7e7207417123fbda@turistforeningen.no>

sebflipper/docker-node,chorrell/docker-node,pesho/docker-node,chorrell/docker-node,nodejs/docker-node,nodejs/docker-node,sirgallifrey/docker-node-test,joyent/docker-node,hmalphettes/docker-node