Add ability to daemonize program, update sample config, README.md, add .gitignore

vendor/github.com/sevlyar/go-daemon/syscall_dup_pre17.go

@@ -0,0 +1,14 @@
+//go:build (!linux || !arm64) && !windows && !go1.7
+// +build !linux !arm64
+// +build !windows
+// +build !go1.7
+
+package daemon
+
+import (
+	"syscall"
+)
+
+func syscallDup(oldfd int, newfd int) (err error) {
+	return syscall.Dup2(oldfd, newfd)
+}