Update the Redux TodoMVC example to add `redux-persist` and use an IPFS storage layer provided by IPFS Companion

ipfs-storage.diff

diff --git a/examples/todomvc/package.json b/examples/todomvc/package.json
index 26dcd9c..1d37ffe 100644
--- a/examples/todomvc/package.json
+++ b/examples/todomvc/package.json
@@ -2,6 +2,7 @@
   "name": "todomvc",
   "version": "0.0.1",
   "private": true,
+  "homepage": "./",
   "devDependencies": {
     "react-scripts": "^1.1.4",
     "react-test-renderer": "^16.3.1"
@@ -13,6 +14,7 @@
     "react-dom": "^16.3.1",
     "react-redux": "^5.0.7",
     "redux": "^3.5.2",
+    "redux-persist": "^5.9.1",
     "reselect": "^3.0.1",
     "todomvc-app-css": "^2.1.1"
   },
diff --git a/examples/todomvc/src/index.js b/examples/todomvc/src/index.js
index d15d78f..27a61b4 100644
--- a/examples/todomvc/src/index.js
+++ b/examples/todomvc/src/index.js
@@ -6,11 +6,26 @@ import App from './components/App'
 import reducer from './reducers'
 import 'todomvc-app-css/index.css'
 
-const store = createStore(reducer)
+import { persistStore, persistReducer } from 'redux-persist'
+import { PersistGate } from 'redux-persist/integration/react'
+import storage from './ipfs-storage'
+
+const persistConfig = {
+  key: 'root',
+  storage,
+}
+
+const persistedReducer = persistReducer(persistConfig, reducer)
+
+const store = createStore(persistedReducer)
+const persistor = persistStore(store)
 
 render(
   <Provider store={store}>
-    <App />
+    <PersistGate loading={null} persistor={persistor}>
+      <App />
+    </PersistGate>
   </Provider>,
   document.getElementById('root')
 )
diff --git a/examples/todomvc/src/ipfs-storage.js b/examples/todomvc/src/ipfs-storage.js
new file mode 100644
index 0000000..56bb616
--- /dev/null
+++ b/examples/todomvc/src/ipfs-storage.js
@@ -0,0 +1,18 @@
+/* global ipfs */
+
+export function createIpfsStorage() {
+  return {
+    getItem: async (key) => {
+      const raw = await ipfs.files.read(`/${key}`)
+      return raw.toString()
+    },
+    setItem: async (key, item) => {
+      await ipfs.files.write(`/${key}`, Buffer.from(item), { create: true, truncate: true })
+    },
+    removeItem: async (key) => {
+      await ipfs.files.rm(`/${key}`)
+    },
+  }
+}
+
+export default createIpfsStorage()