Fix missing vendor dir

vendor/github.com/tklauser/go-sysconf/README.md

@@ -0,0 +1,46 @@
+# go-sysconf
+
+[![Go Reference](https://pkg.go.dev/badge/github.com/tklauser/go-sysconf.svg)](https://pkg.go.dev/github.com/tklauser/go-sysconf)
+[![GitHub Action Status](https://github.com/tklauser/go-sysconf/workflows/Tests/badge.svg)](https://github.com/tklauser/go-sysconf/actions?query=workflow%3ATests)
+
+`sysconf` for Go, without using cgo or external binaries (e.g. getconf).
+
+Supported operating systems: Linux, macOS, DragonflyBSD, FreeBSD, NetBSD, OpenBSD, Solaris/Illumos.
+
+All POSIX.1 and POSIX.2 variables are supported, see [References](#references) for a complete list.
+
+Additionally, the following non-standard variables are supported on some operating systems:
+
+| Variable | Supported on |
+|---|---|
+| `SC_PHYS_PAGES`       | Linux, macOS, FreeBSD, NetBSD, OpenBSD, Solaris/Illumos |
+| `SC_AVPHYS_PAGES`     | Linux, OpenBSD, Solaris/Illumos |
+| `SC_NPROCESSORS_CONF` | Linux, macOS, FreeBSD, NetBSD, OpenBSD, Solaris/Illumos |
+| `SC_NPROCESSORS_ONLN` | Linux, macOS, FreeBSD, NetBSD, OpenBSD, Solaris/Illumos |
+| `SC_UIO_MAXIOV`       | Linux |
+
+## Usage
+
+```Go
+package main
+
+import (
+	"fmt"
+
+	"github.com/tklauser/go-sysconf"
+)
+
+func main() {
+	// get clock ticks, this will return the same as C.sysconf(C._SC_CLK_TCK)
+	clktck, err := sysconf.Sysconf(sysconf.SC_CLK_TCK)
+	if err == nil {
+		fmt.Printf("SC_CLK_TCK: %v\n", clktck)
+	}
+}
+```
+
+## References
+
+* [POSIX documenation for `sysconf`](http://pubs.opengroup.org/onlinepubs/9699919799/functions/sysconf.html)
+* [Linux manpage for `sysconf(3)`](http://man7.org/linux/man-pages/man3/sysconf.3.html)
+* [glibc constants for `sysconf` parameters](https://www.gnu.org/software/libc/manual/html_node/Constants-for-Sysconf.html)