Remove "I AM NOT DONE" and the verify mode and add AppState

exercises/05_vecs/vecs1.rs

@@ -7,8 +7,6 @@
 //
 // Execute `rustlings hint vecs1` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 fn array_and_vec() -> ([i32; 4], Vec<i32>) {
     let a = [10, 20, 30, 40]; // a plain array
     let v = // TODO: declare your vector here with the macro for vectors