chore: Update main maintainer info

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

.github/CODEOWNERS

@@ -0,0 +1,2 @@
+# App maintainers
+* @ChristophWurst

README.md

@@ -41,6 +41,11 @@ The rating depends on the installed text processing backend. See [the rating ove
 
 Learn more about the Nextcloud Ethical AI Rating [in our blog](https://nextcloud.com/blog/nextcloud-ethical-ai-rating/).
 
+## Maintainers
+
+* [Christoph Wurst](https://github.com/ChristophWurst)
+* [Nextcloud Groupware team](https://github.com/nextcloud/groupware/#members)
+
 ## Installation
 
 The app is distributed through the [app store](https://apps.nextcloud.com/apps/mail) and you can install it [right from your Nextcloud installation](https://docs.nextcloud.com/server/stable/admin_manual/apps_management.html).

appinfo/info.xml

@@ -31,7 +31,7 @@ Learn more about the Nextcloud Ethical AI Rating [in our blog](https://nextcloud
 	]]></description>
 	<version>3.5.0-alpha.2</version>
 	<licence>agpl</licence>
-	<author>Greta Doçi</author>
+	<author>Christoph Wurst</author>
 	<author homepage="https://github.com/nextcloud/groupware">Nextcloud Groupware Team</author>
 	<namespace>Mail</namespace>
 	<documentation>