Add simple quick-start for developers
Add simple quick-start for developers

Simple documentation on getting started with the codebase.

Expects the vendor/ PR to be in place so that there are
no requirements on the developer acquiring Go dependency
packages.

Signed-off-by: Phil Estes <dbac1f450dc8326caa7ba104b384a0eca642250c@linux.vnet.ibm.com>

mikebrow/containerd,miaoyq/containerd,kunalkushwaha/containerd,kunalkushwaha/containerd,chanezon/containerd,yuexiao-wang/containerd,docker/containerd,hqhq/containerd,dmcgowan/containerd,vdemeester/containerd,estesp/containerd,lichao-mobanche/containerd,estesp/containerd,Wolphin-project/containerd,vdemeester/containerd,thaJeztah/containerd,thaJeztah/containerd,containerd/containerd,rajasec/containerd,miaoyq/containerd,crosbymichael/containerd,AkihiroSuda/containerd,xiekeyang/containerd,containerd/containerd,crosbymichael/containerd,dmcgowan/containerd,mikebrow/containerd