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

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

@@ -0,0 +1,24 @@
+//go:build darwin || dragonfly || freebsd || linux || netbsd || openbsd || plan9
+// +build darwin dragonfly freebsd linux netbsd openbsd plan9
+
+package daemon
+
+import (
+	"syscall"
+)
+
+func lockFile(fd uintptr) error {
+	err := syscall.Flock(int(fd), syscall.LOCK_EX|syscall.LOCK_NB)
+	if err == syscall.EWOULDBLOCK {
+		err = ErrWouldBlock
+	}
+	return err
+}
+
+func unlockFile(fd uintptr) error {
+	err := syscall.Flock(int(fd), syscall.LOCK_UN)
+	if err == syscall.EWOULDBLOCK {
+		err = ErrWouldBlock
+	}
+	return err
+}