add gitignore

.gitignore

@@ -0,0 +1,21 @@
+*.log
+*/*
+!*/config
+!*/rootfs
+*/rootfs/*
+!*/rootfs/etc/
+*/rootfs/etc/*
+!*/rootfs/etc/hosts
+!*/rootfs/etc/sysctl.conf
+
+!*/rootfs/etc/network/
+*/rootfs/etc/network/*
+!*/rootfs/etc/network/interfaces
+!*/rootfs/etc/network/firewall
+!*/rootfs/etc/network/firewall6
+
+!*/rootfs/etc/bird/
+*/rootfs/etc/bird/*
+!*/rootfs/etc/bird/bird.conf
+!*/rootfs/etc/bird/bird6.conf
+