stub edit

pttodoest/src/main.rs

@@ -6,6 +6,10 @@ use std::io::{BufRead, Read, Write};
 pub fn main() {
     let flags = Flags::new().expect("failed to flags");
 
+    if let Some(add) = flags.add {
+        panic!("not impl: add {}", add);
+    }
+
     if flags.edit {
         edit(flags.files().expect("couldnt find files from flags")).expect("failed to edit");
     }