Add communication with user actor

src/data/entity_manager.rs

@@ -1,4 +1,5 @@
 use std::path::{Path, PathBuf};
+use std::slice::Iter;
 
 use crate::utils::err::Res;
 
@@ -44,4 +45,9 @@ impl<E> EntityManager<E> where E: serde::Serialize + serde::de::DeserializeOwned
         self.list.push(el);
         self.save()
     }
+
+    /// Iterate over the entries of this entity manager
+    pub fn iter(&self) -> Iter<'_, E> {
+        self.list.iter()
+    }
 }