Can create user accounts

src/data/entity_manager.rs

@@ -91,4 +91,21 @@ impl<E> EntityManager<E>
     pub fn cloned(&self) -> Vec<E> {
         self.list.clone()
     }
+
+    pub fn update_or_replace(&mut self, entry: E) -> Res {
+        let mut found = false;
+        for i in &mut self.list {
+            if i == &entry {
+                *i = entry.clone();
+                found = true;
+                break;
+            }
+        }
+
+        if !found {
+            self.list.push(entry);
+        }
+
+        self.save()
+    }
 }