Fix missing vendor dir

vendor/github.com/tklauser/numcpus/README.md

@@ -0,0 +1,52 @@
+# numcpus
+
+[![Go Reference](https://pkg.go.dev/badge/github.com/tklauser/numcpus.svg)](https://pkg.go.dev/github.com/tklauser/numcpus)
+[![GitHub Action Status](https://github.com/tklauser/numcpus/workflows/Tests/badge.svg)](https://github.com/tklauser/numcpus/actions?query=workflow%3ATests)
+
+Package numcpus provides information about the number of CPUs in the system.
+
+It gets the number of CPUs (online, offline, present, possible, configured or
+kernel maximum) on Linux, Darwin, FreeBSD, NetBSD, OpenBSD, DragonflyBSD or
+Solaris/Illumos systems.
+
+On Linux, the information is retrieved by reading the corresponding CPU
+topology files in `/sys/devices/system/cpu`.
+
+On BSD systems, the information is retrieved using the `hw.ncpu` and
+`hw.ncpuonline` sysctls, if supported.
+
+Not all functions are supported on Darwin, FreeBSD, NetBSD, OpenBSD,
+DragonflyBSD and Solaris/Illumos. ErrNotSupported is returned in case a
+function is not supported on a particular platform.
+
+## Usage
+
+```Go
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/tklauser/numcpus"
+)
+
+func main() {
+	online, err := numcpus.GetOnline()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "GetOnline: %v\n", err)
+	}
+	fmt.Printf("online CPUs: %v\n", online)
+
+	possible, err := numcpus.GetPossible()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "GetPossible: %v\n", err)
+	}
+	fmt.Printf("possible CPUs: %v\n", possible)
+}
+```
+
+## References
+
+* [Linux kernel sysfs documentation for CPU attributes](https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-devices-system-cpu)
+* [Linux kernel CPU topology documentation](https://www.kernel.org/doc/Documentation/cputopology.txt)