edit to readme, and reverted front end react-router-dom version

README.md

@@ -47,12 +47,14 @@ The Zoom Marketplace build flow for a Zoom App may be found [here](https://marke
 
 The following are steps to take in each of the tabs in the build flow . . .
 
-#### App Credentials
+#### App Credentials (optional)
 
 
 If you enabled the "List app on Marketplace to be added by any Zoom user" toggle while creating your app on the Marketplace, you will see the following two sections: Development and Production.
 Note: The above option should only be selected if you intend to publish the app to the marketplace. This option can be enabled later as well under the "Activation" tab. The "Activation" tab only appears if you have not selected to list the app to be published 
 
+#### Setup on Zoom Marketplace
+
 `your Ngrok origin` = ie. `https://9a20-38-99-100-7.ngrok.io`
 Follow these instructions for the "Development" section
 - Add `<your Ngrok origin>/api/zoomapp/home` in the Home URL field
@@ -118,7 +120,7 @@ Follow these instructions for the "Development" section
 
 #### Scopes
 
-- Add the following Scopes required for this Advanced Sample Zoom App: `zoomapp:inmeeting`, `user:read`
+- Add the following **Scopes** required for this Advanced Sample Zoom App: `zoomapp:inmeeting`, `user:read` -- for `user:read`, enable all permissions with format `user:read:xxx` -- this can be done by searching `user:read` in the search bar:![alt text](screenshots/marketplace.zoom.us_develop_applications_Es_XW0ZYTXeXlYH7UNCJIA_scopes_mode=dev.png)
   - The Scopes referred to here are for the Zoom API - they are not exclusive to Zoom Apps. Please find documentation for the Zoom API [here](https://marketplace.zoom.us/docs/api-reference/introduction)
   - As with the Zoom App SDK APIs and events from the 'Features' tab, scopes selected here will be presented to users for consent before they may use the Zoom App.