Added photos reducer.

redux/root.saga.js

@@ -1,7 +1,8 @@
 import { all, call } from "redux-saga/effects";
 import { appSagas } from "./app/app.sagas";
+import { photosSagas } from "./photos/photos.sagas";
 import { userSagas } from "./user/user.sagas";
 
 export default function* rootSaga() {
-  yield all([call(userSagas), call(appSagas)]);
+  yield all([call(userSagas), call(appSagas), call(photosSagas)]);
 }