Add basic methods into NavigatedPage

src/import.rs

@@ -0,0 +1,28 @@
+use iced::{Element, Task};
+use crate::navigation::{NavigatedPage, Page, RootMessage};
+
+struct ImportState {}
+enum ImportMessage {
+    Back
+}
+
+impl NavigatedPage<ImportMessage> for ImportState {
+    fn navigate(&self, message: &ImportMessage) -> Option<Page> {
+        if let ImportMessage::Back = message {
+            return Some(Page::PreviousPage)
+        }
+        None
+    }
+
+    fn navigated(&mut self) {
+    }
+
+    fn update(&mut self, message: ImportMessage) -> Task<RootMessage> {
+        todo!()
+    }
+
+    fn view(&self) -> Element<'_, ImportMessage> {
+        todo!()
+    }
+}
+