add program description to --help

src/cli.rs

@@ -11,6 +11,7 @@ use std::error::Error;
 use std::fmt;
 use std::iter;
 
+/// Simple program to show the time in different timezones
 #[derive(Parser, Debug)]
 #[command(version, about, long_about = None)]
 pub struct Args {
@@ -20,6 +21,10 @@ pub struct Args {
     #[arg(short, long)]
     pub date: Option<String>,
 
+    /// number of preceding and succeeding time records in the timetable
+    #[arg(short, long, default_value_t = 5)]
+    pub padding: i8,
+
     #[arg(short, long, default_value = "Local")]
     pub local: String,