add release notes for captions

docs/release_notes/8.x-2.0.md

@@ -29,4 +29,20 @@ It is recommended to test this method in a staging/development environment befor
 10. Create a new object and make sure it persists to Fedora and the Fedora URI likn resolves correctly. Make sure that no new entries get added to Gemini.
 11. If you're feeling brave, you can then remove Gemini like
     i. `rm /var/www/html/Crayfish/Gemini`
-    ii. Remove the gemini database and the associated mysql user
+    ii. Remove the gemini database and the associated mysql user
+
+
+## Adding Captions
+1. Make sure you are on the most recent code of islandora and islandora_defaults (`composer update islandora/islandora islandora/islandora_defaults`)
+2. Do a config import on the `config/install` directory of `islandora_defaults` or copy the changed files into another directory and import those (if you are on an existing install, i'd recommend the partial config import). The changed files are:
+    i. core.entity_form_display.media.audio.default
+    ii. core.entity_form_display.media.video.default
+    iii. core.entity_view_display.media.audio.default
+    iv. core.entity_view_display.media.audio.source
+    v. core.entity_view_display.media.video.default
+    vi. core.entity_view_display.media.video.source
+    vii. field.field.media.audio.field_track
+    viii. field.field.media.video.field_track
+    ix. field.storage.media.field_track
+3. clear your drupal cache `drush cr`
+4. You should now see a "track" field on audio and video media objects