add more unified remote default keys, README updates

Author: Nerwyn

README.md

@@ -63,12 +63,16 @@ This card supports several media platforms with default key and source lists. Fo
 | [Sony BRAVIA](https://www.home-assistant.io/integrations/braviatv/)        | Default keys             | Default sources and slider                                                                                                             | [ADB](https://www.home-assistant.io/integrations/androidtv/) remote (preferred) or media player           |
 | [Fire TV](https://www.home-assistant.io/integrations/androidtv/)           | Default keys             | Default sources and slider                                                                                                             | Remote (preferred) or media player                                                                        |
 | [Roku](https://www.home-assistant.io/integrations/roku/)                   | Default keys             | Default sources and slider                                                                                                             | Remote for keyboard, media player for search (provide one for keyboard ID and the others in their fields) |
-| [LG webOS](https://www.home-assistant.io/integrations/webostv/)            | NA                       | Default keys, sources, and slider                                                                                                      | Media Player                                                                                              |
+| [LG webOS](https://www.home-assistant.io/integrations/webostv/)            | NA                       | Default keys, sources, and slider                                                                                                      | Media player                                                                                              |
 | [Kodi](https://www.home-assistant.io/integrations/kodi/)                   | NA                       | Default keys, sources, and slider                                                                                                      | Media player                                                                                              |
 | [Unified Remote](https://github.com/DaviPtrs/hass-unified-remote)          | NA (see below)           | NA (see below)                                                                                                                         | NA (see below)                                                                                            |
 | [Apple TV](https://www.home-assistant.io/integrations/apple_tv)            | Default keys             | Default sources and slider                                                                                                             | NA                                                                                                        |
 | [Samsung TV](https://www.home-assistant.io/integrations/samsungtv/)        | Default keys             | Default sources (requires the [SamsungTV Smart Component custom integration](https://github.com/ollo69/ha-samsungtv-smart)) and slider | NA                                                                                                        |
-| [Jellyfin](https://www.home-assistant.io/integrations/jellyfin/)           | Default keys             | Play/Pause and slider                                                                                                                  | NA                                                                                                        |
+| [Jellyfin](https://www.home-assistant.io/integrations/jellyfin/)           | Default keys             | Play/pause and slider                                                                                                                  | NA                                                                                                        |
+
+### Samsung TV Sources
+
+The Home Assistant Samsung TV integration does not allow you to change sources. To do so you need to setup the [SamsungTV Smart Component custom integration](https://github.com/ollo69/ha-samsungtv-smart) and provide it's media player entity ID to this card.
 
 ### Unified Remote Setup