initial code for tag stripping and m3u generation

src/input.rs

@@ -42,6 +42,12 @@ pub (crate) enum Command {
         #[arg(long, short)]
         podcast : String,
     },
+    /// Tags files and generates playlists ready for use with an iPod.
+    Tag {
+        /// The podcast to tag and generate playlists for.
+        #[arg(long, short)]
+        podcast : Option<String>,
+    },
 }
 
 /// Struct modelling configuration file format.