add roadmap

Author: joeferraro

README.md

@@ -43,4 +43,13 @@ CookieManager.clearAll((err, res) => {
   console.log(res);
 });
 
-```
+```
+
+### Roadmap
+
+- Expose `get` method
+- Proper `getAll` dictionary by domain
+- Proper error handling
+- Anything else?
+
+PR's welcome!