make networks required for peer

add.go

@@ -29,6 +29,7 @@ func Add() {
 		PrivateKey:   privateKey, // omitted from server config JSON!
 		PresharedKey: GenerateJSONKey(),
 		IP:           IP,
+		Networks:     []JSONIPNet{},
 	}
 
 	conf.MustAddPeer(peer)

configtypes.go

@@ -25,7 +25,7 @@ type PeerConfig struct {
 	// TODO ExternalIP support (Endpoint)
 	//ExternalIP     net.UDPAddr `validate:"required,udp4_addr"`
 	// TODO support routing additional networks (AllowedIPs)
-	Networks []JSONIPNet
+	Networks []JSONIPNet `validate:"required"`
 }
 
 type DsnetConfig struct {