add AppRun parameters - provided a help menu

linux/packaging/appimage/AppRun

@@ -1,9 +1,57 @@
-#!/bin/bash
+#!/bin/bash -x
 
 cd "$(dirname "$0")"
 export LD_LIBRARY_PATH=usr/lib
-if [ "$1" == "HiddifyService" ];then
-    exec ./$@
-else
-    exec ./hiddify $@
+
+# Usage info
+show_help() {
+cat << EOF
+Usage: ${0##*/} [-s | -v | -h ] ...
+start Hiddify or HiddifyService, when no parameter is given, Hiddify is executed.
+    -h              display this help and exit
+    -s start|stop   start/stop HiddifyService.
+    -v              show version
+EOF
+}
+show_version() {
+    printf "Hiddify version "
+    jq .version <./data/flutter_assets/version.json
+}
+# Initialize variables:
+service=0 #declare -i service
+OPTIND=1
+
+# Resetting OPTIND is necessary if getopts was used previously in the script.
+# It is a good idea to make OPTIND local if you process options in a function.
+
+# if no arg is provided, execute hiddify app
+[[ $# == 0 ]] && exec hiddify
+
+# processing arguments
+while getopts s:vh opt; do
+    case $opt in
+        h)
+            show_help
+            exit 0
+            ;;
+        v)  show_version
+            exit 0
+            ;;
+        s)  action="$OPTARG"
+            ((service++))
+            ;;
+        *)
+            show_help >&2
+            exit 1
+            ;;
+    esac
+done
+shift "$((OPTIND-1))"   # Discard the options and sentinel --
+
+# argument -s is given, do HiddfyService
+if [[ "$service" == 1 ]]; then
+    if [[ "$action" =~ start|stop ]]; then
+        exec ./HiddifyService "$action"
+    fi
 fi
+