allow public uses of structs; add sample program

src/exit.rs

@@ -1,8 +1,7 @@
 use crate::Position;
-use std::iter::Enumerate;
 
 #[derive(Debug, Eq, PartialEq)]
-pub(crate) enum Transition {
+pub enum Transition {
     None,
     FadeToWhite,
     FadeToBlack,
@@ -49,9 +48,9 @@ impl ToString for Transition {
 #[derive(Debug, Eq, PartialEq)]
 pub struct Exit {
     /// destination
-    pub(crate) room: String,  /// id
-    pub(crate) position: Position,
-    pub(crate) effect: Transition,
+    pub room: String,  /// id
+    pub position: Position,
+    pub effect: Transition,
 }
 
 impl From<String> for Exit {