Add release-notes file

Author: oliverguenther

docs/release-notes/12-4-5/README.md

@@ -0,0 +1,20 @@
+---
+title: OpenProject 12.4.5
+sidebar_navigation:
+    title: 12.4.5
+release_version: 12.4.5
+release_date: 2023-02-23
+---
+
+# OpenProject 12.4.5
+
+Release date: 2023-02-23
+
+We released [OpenProject 12.4.5](https://community.openproject.com/versions/1657).
+The release contains several bug fixes and we recommend updating to the newest version.
+
+<!--more-->
+#### Bug fixes and changes
+
+- Fixed: Timeout when bulk editing work package assignees across projects \[[#46284](https://community.openproject.com/wp/46284)\]
+- Fixed: Groups can no longer have their notifications suppressed \[[#46330](https://community.openproject.com/wp/46330)\]

docs/release-notes/README.md

@@ -14,6 +14,13 @@ Stay up to date and get an overview of the new features included in the releases
 <!--- New release notes are generated below. Do not remove comment. -->
 <!--- RELEASE MARKER -->
 
+## 12.4.5
+
+Release date: 2023-02-23
+
+[Release Notes](12-4-5/)
+
+
 ## 12.4.4
 
 Release date: 2023-02-15