Added help page.

nstart.zsh

@@ -1,5 +1,39 @@
 #!/bin/zsh
 
+ show_help() {
+print -P -- \
+"%BUsage:%b nstart
+
+Quickly connect to a NetworkManager profile and start Xray.
+
+nstart is intended for fast interactive use, replacing repetitive commands
+such as %F{cyan}nmcli c u wifi%f followed by manually starting Xray.
+
+%BConfiguration:%b
+  %F{green}XRAY_CONFIG_FILE%f
+        Path to the Xray configuration file.
+
+  %F{green}DEFAULT_CONNECTIONS_NM%f
+        Preferred NetworkManager connections.
+
+        typeset -xT DEFAULT_CONNECTIONS_NM nmcli_def_conns
+        nmcli_def_conns=( wifi home work )
+
+%BBehavior:%b
+  nstart first offers connections from DEFAULT_CONNECTIONS_NM.
+  If none is selected, it lets you choose from all profiles found by
+  %F{cyan}nmcli connection show%f.
+
+  After NetworkManager connects successfully, Xray is started with:
+
+        %F{cyan}xray run -c \"\$XRAY_CONFIG_FILE\"%f
+
+%BContributing:%b
+  Bugs, patches and improvements are welcome:
+  %F{blue}https://git.vpnpickup.com/artobyte/nstart%f"
+}
+
+
 spinner() {
   local pid=$1
   local text=$2
@@ -23,7 +57,8 @@ print_numbered_list() {
 }
 
 if [[ "$1" == "-h" || "$1" == "--help" ]]; then
-    
+    show_help
+    exit 0
 fi
 
 connections=( ${(f)"$(nmcli --terse --fields NAME connection show)"} )