Add systemd service example file
Add systemd service example file

chrisohaver/coredns,Infoblox-CTO/coredns,jremond/coredns,Infoblox-CTO/coredns,miekg/coredns,jremond/coredns,varyoo/coredns,yongtang/coredns,ii/coredns,ii/coredns,johnbelamaric/coredns,johnbelamaric/coredns,Infoblox-CTO/coredns,miekg/coredns,coredns/coredns