Adding Nook to README

Signed-off-by: Christian Wolf <github@christianwolf.email>

README.md

@@ -19,6 +19,7 @@ The currently available clients are
 
 - Nextcloud Cookbook (by MicMun) ([Google Play](https://play.google.com/store/apps/details?id=de.micmun.android.nextcloudcookbook&hl=en_US&gl=US), [FDroid](https://f-droid.org/en/packages/de.micmun.android.nextcloudcookbook/), [homepage](https://micmun.de/nextcloud-cookbook-english/))
 - [Nextcloud Cookbook](https://github.com/Teifun2/nextcloud-cookbook-flutter) (by Teifun2) ([Google Play](https://play.google.com/store/apps/details?id=com.nextcloud_cookbook_flutter&hl=en_US&gl=US), [FDroid](https://f-droid.org/en/packages/com.nextcloud_cookbook_flutter/))
+- Nook ([Google Play](https://play.google.com/store/apps/details?id=org.capacitor.cookbook.app))
 
 ### Browser plugins/scripts