NMAPDEV plugin work #645 🆕🔎

front/plugins/nmap_dev_scan/README.md

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+## Overview
+
+Arp-scan is a command-line tool that uses the ARP protocol to discover and fingerprint IP hosts on the local network. An alternative to ARP scan is to enable the `PIHOLE_RUN` PiHole integration settings. The arp-scan (and other Network-scan plugin times using the `SCAN_SUBNETS` setting) time depends on the number of IP addresses to check so set this up carefully with the appropriate network mask and interface. Check the [subnets documentation](https://github.com/jokob-sk/NetAlertX/blob/main/docs/SUBNETS.md) for help on setting up VLANs, what VLANs are supported, or how to figure out the network mask and your interface. 
+
+### Usage
+
+- Go to settings and set the `SCAN_SUBNETS` setting as per [subnets documentation](https://github.com/jokob-sk/NetAlertX/blob/main/docs/SUBNETS.md).
+- Enable the plugin by changing the RUN parameter from disabled to your preferred run time (usually: `schedule`).
+  - Specify the schedule in the `ARPSCAN_RUN_SCHD` setting
+- Adjust the timeout if needed in the `ARPSCAN_RUN_TIMEOUT` setting
+- Review remaining settings
+- SAVE
+- Wait for the next scan to finish
+
+#### Examples
+
+Settings:
+
+![settings](/front/plugins/arp_scan/arp-scan-settings.png)
+