added a readme and took the example from the go library

tools/nmap_scanning/README.md

@@ -0,0 +1,19 @@
+# Nmap Go module: 
+### How to Build it:
+```
+# setup a go module pointing here:
+go mod init git.mcdevitt.tech/bpmcdevitt/security_research/tools/nmap_scanning
+# get the nmap library:
+go get github.com/Ullaakut/nmap/v2
+```
+
+### Create and test a new scan example
+```
+# create a directory
+mkdir basic_scan
+cd basic_scan
+# create a main.go file in that directory.
+go build .
+# run it
+go run .
+```

tools/nmap_scanning/basic_scan/main.go

@@ -0,0 +1,47 @@
+// taken from https://github.com/Ullaakut/nmap/blob/master/examples/basic_scan/main.go
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"time"
+
+	"github.com/Ullaakut/nmap/v2"
+)
+
+func main() {
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Minute)
+	defer cancel()
+
+	// Equivalent to `/usr/local/bin/nmap -p 80,443,843 google.com facebook.com youtube.com`,
+	// with a 5 minute timeout.
+	scanner, err := nmap.NewScanner(
+		nmap.WithTargets("google.com", "facebook.com", "youtube.com"),
+		nmap.WithPorts("80,443,843"),
+		nmap.WithContext(ctx),
+	)
+	if err != nil {
+		log.Fatalf("unable to create nmap scanner: %v", err)
+	}
+
+	result, _, err := scanner.Run()
+	if err != nil {
+		log.Fatalf("unable to run nmap scan: %v", err)
+	}
+
+	// Use the results to print an example output
+	for _, host := range result.Hosts {
+		if len(host.Ports) == 0 || len(host.Addresses) == 0 {
+			continue
+		}
+
+		fmt.Printf("Host %q:\n", host.Addresses[0])
+
+		for _, port := range host.Ports {
+			fmt.Printf("\tPort %d/%s %s %s\n", port.ID, port.Protocol, port.State, port.Service.Name)
+		}
+	}
+
+	fmt.Printf("Nmap done: %d hosts up scanned in %.2f seconds\n", len(result.Hosts), result.Stats.Finished.Elapsed)
+}