redux example rename

docs/examples/todos-redux/src/reducers/todos.js

@@ -0,0 +1,22 @@
+const todos = (state = [], action) => {
+  if(action.type == 'ADD_TODO') {
+    return [
+      ...state,
+      {
+        id: action.id,
+        text: action.text,
+        completed: false
+      }
+    ]
+  } else if(action.type == 'TOGGLE_TODO') {
+    return state.map(todo =>
+      (todo.id === action.id)
+        ? {...todo, completed: !todo.completed}
+        : todo
+    )
+  } else {
+    return state
+  }
+}
+
+export default todos