added small readme file to explain the required config file

scripts/README.md

+You will need to create a config.json file in the scripts directory containing the following fields:
+
+    {
+            access_token - this will be your personal access token as a string
+        from_project_id - this will be the project id you are copying from
+        to_project_id - this will be the project id that you are copying to
+    }
\ No newline at end of file