Add more documentation on download access token

sample/README.md

@@ -5,9 +5,11 @@ Use this sample application to view Kujaku's features. Add the following lines i
 
 ```
 mapbox.repo.token="[YOUR MAPBOX REPO ACCESS TOKEN]"
-mapbox.sdk.token="[YOUR MAPBOX SDK TOKEN]"
+mapbox.sdk.token=[YOUR MAPBOX SDK TOKEN]
 cgr.username="[YOUR_CGR_USERNAME_WITHOUT_BRACKETS]"
 cgr.password="[YOUR_CGR_PASSWORD_WITHOUT_BRACKETS]"
 cgr.url="[CGR_URL_WITHOUT_BRACKETS]"
 ```
-If you don't have a Mapbox account, [sign up](https://www.mapbox.com/signup/), and then navigate to your [Account](https://www.mapbox.com/account/) page. Copy your default public token to your clipboard then use it as `[YOUR MAPBOX SDK TOKEN]` above. 
+If you don't have a Mapbox account, [sign up](https://www.mapbox.com/signup/), and then navigate to your [Account](https://www.mapbox.com/account/) page. Copy your default public token to your clipboard then use it as `[YOUR MAPBOX SDK TOKEN]` above. Generate another token, a secret access token, that gives you access to `Downloads:Read` scope. This allows you to access the Mapbox repository with the dependencies
+
+**NB: The `mapbox.sdk.token` has double quotation marks around the value while the `mapbox.repo.token` does not have double quotation marks around the value.**