Add release-notes file

Author: oliverguenther

docs/release-notes/10-6-4/README.md

@@ -0,0 +1,16 @@
+---
+title: OpenProject 10.6.4
+sidebar_navigation:
+    title: 10.6.4
+release_version: 10.6.4
+release_date: 2020-06-30
+---
+
+# OpenProject 10.6.4
+
+We released [OpenProject 10.6.4](https://community.openproject.com/versions/1443).
+The release contains several bug fixes and we recommend updating to the newest version.
+
+<!--more-->
+#### Bug fixes and changes
+

docs/release-notes/README.md

@@ -12,6 +12,13 @@ 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 -->
 
+## 10.6.4
+
+Release date: 2020-06-30
+
+[Release Notes](10-6-4/)
+
+
 ## 10.6.3
 
 Release date: 2020-06-29