features: add access requests feature walk through

docs/features/features-walk-through/access_requests.md

@@ -0,0 +1,38 @@
+# Request access to restricted files of a record
+
+_Introduced in InvenioRDM v12_
+
+You can allow authenticated and non-authenticated (guest) users to request access to view the restricted files of a public record. Access can be set to expire on a specific date as well as never expire.
+
+This can be useful for record owners to manage access to restricted files of each record. For unauthorized users, it gives the possibility to request access to the files.
+
+Note: accepted access requests grant to the requestor access to **all** versions of the record.
+
+## Enable access requests
+
+As a record owner, you first need to allow accessing restricted files via a request:
+0. Create a record with restricted files
+1. Click on the "Share" button on the record landing page:
+![Share button](./img/access_request_share_button.png)
+2. Navigate to the "Access requests" tab of the modal:
+![Access requests tab](./img/access_requests_tab.png)
+3. Change the settings for the access requests:
+*  Allow authenticated or/and unauthenticated users to request access to restricted files of your record.
+*  Accept conditions. Provide a message that will be visible to the users in the request form (see screenshots below)
+*  Set access expiration date. This setting will be applied by default to all access requests. When reviewing an access request, you can set a different value.
+4. Save your changes
+![Access requests tab save](./img/access_requests_tab_save.png)
+
+Now both authenticated and anonymous users are able to **request** view access to your record’s files. You need to approve their request to grant them access to your record's files.
+
+## Request access to restricted files
+
+As a user that would like to get access to restricted files of a record, it is necessary to **fill in the request form** appearing in the record landing page. This action creates and submits a new access request: the record's owner will be notificed, and the request will appear on their respectives dashboards.
+
+## Accepting/Declining the request
+
+The submitter and the record's owner can find the newly created access request in "My dashboard" -> "Requests", and can exchange comments. The record's owner can define a new expiration date (changing the default settings) for this access request, accept or decline it:
+![Access request request page guest](./img/access_request_request_page_guest.png)
+
+After accepting the request, the requestor will receive a notification by e-mail and will be able to access the restricted files:
+![Restricted files open to guest](./img/restricted_files_open_to_guest.png)