Enable admin setting user for a system

app/Http/Requests/SystemRegister.php

@@ -78,6 +78,7 @@ class SystemRegister extends FormRequest
 				'mailer_details.*.port' => 'nullable|digits_between:2,5',
 				'zt_id' => 'nullable|size:10|regex:/^([A-Fa-f0-9]){10}$/|unique:systems,zt_id,'.($so->exists ? $so->id : 0),
 				'pkt_type' => ['required',Rule::in(array_keys(Packet::PACKET_TYPES))],
+				'users' => 'nullable|array|min:1|max:2',
 			] : [],
 			$so->exists ? [
 				'active' => 'required|boolean',