docs: add WienIT to End Users (#310)

* add WienIT to End Users

Signed-off-by: Daniel Chambre <smiyc@pm.me>

Author: smiyc

content/end_users/logo/Thumbs.db

@@ -0,0 +1,13 @@
+---
+title: WienIT
+image: logo/wienit.jpg
+homepage: https://www.wienit.at/
+weight: 10
+---
+
+> _We've discovered CloudNativePG in April 2022 while searching for a HA PostgreSQL solution.
+After comparing it to the Zalando Operator we decided to go with CloudNativePG because of the excellent documentation and most of all the supportive community.
+Since April 2024 we are running CloudNativePG as our main PostgreSQL platform.
+We're excited about the future of the project as part of the CNCF Landscape!_
+\
+— Daniel Chambre, DBA, WienIT GmbH