Add appveyor config to git
Add appveyor config to git

Closes #2537

Signed-off-by: Stéphane Graber <089afc6d81f66f1168a9849e15660feae286e024@ubuntu.com>

mjeanson/lxd,Skarlso/lxd,lxc/lxd,hallyn/lxd,lxc/lxd,stgraber/lxd,lxc/lxd,chrisglass/lxd,lxc/lxd,hallyn/lxd,lxc/lxd,mjeanson/lxd,akshaykarle/lxd,pcdummy/lxd,stgraber/lxd,hallyn/lxd,hallyn/lxd,chrisglass/lxd,stgraber/lxd,stgraber/lxd,pcdummy/lxd,erikmack/lxd,stgraber/lxd,stgraber/lxd,georghopp/lxd,Skarlso/lxd,techtonik/lxd,hallyn/lxd,techtonik/lxd,erikmack/lxd,erikmack/lxd,chrisglass/lxd,atxwebs/lxd,atxwebs/lxd,ollie314/lxd,techtonik/lxd,stgraber/lxd,akshaykarle/lxd,georghopp/lxd,atxwebs/lxd,jsavikko/lxd,lxc/lxd,akshaykarle/lxd,atxwebs/lxd,lxc/lxd,mjeanson/lxd,jsavikko/lxd,ollie314/lxd,Skarlso/lxd,jsavikko/lxd,hallyn/lxd,georghopp/lxd,pcdummy/lxd,ollie314/lxd,Skarlso/lxd