Create troubleshoot.md

troubleshoot.md

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+If no device is found after running `ls -l /dev/serial/by-id` reboot the zigbee2mqtt lxc and try again.
+
+Make sure Proxmox sees the device by running `ls -l /dev/serial/by-id` from the Proxmox web shell.
+
+If Proxmox sees your device, you can try setting autodev by running the below script from the Proxmox web shell.
+```
+bash -c "$(wget -qLO - https://raw.githubusercontent.com/tteck/Proxmox/main/autodev.sh)" -s 100
+```
+change 100 to your LXC ID.
+
+Note: The changes will apply after a reboot of the LXC.