added redux

client/js/redux/actions.js

@@ -0,0 +1,23 @@
+import * as types from "./constants";
+
+function initPreview(posts){
+    return{
+        type: types.INIT_PREVIEW,
+        posts
+    }
+}
+
+//using redux-thunk we can modify actions before they get called
+//in this case we can send the http request here rather in the react component
+export function fetchPreview(){
+    return (dispatch) => {
+        return fetch('/metadata.json')
+            .then(response => response.json())
+            .then(json => {
+               dispatch(initPreview(json)); 
+            })
+            .catch(error => {
+                console.log(error);
+            });
+    }
+}