DOC: Update changelog and release guidelines

CHANGELOG.md

@@ -6,6 +6,22 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 
+## [Unreleased] ##
+
+### Added ###
+
+### Changed ###
+
+### Deprecated ###
+
+### Removed ###
+
+### Fixed ###
+
+### Security ###
+
+### Documentation ###
+
 ## [0.3] - 2023-01-19
 (Florian Spreckelsen)
 

RELEASE_GUIDELINES.md

@@ -28,8 +28,12 @@ guidelines of the CaosDB Project
 
 7. Delete the release branch.
 
-8. Prepare the next release cycle by updating
-   [CMakeLists.txt](./CMakeLists.txt) - bump the version number of
-   `CAOSDB_PROTO_VERSION` to the next minor number.
+8. Merge the `main` branch back into `dev` 
 
-9. Create release on gitlab.indiscale.com and gitlab.com
+9. Prepare the next release cycle by updating [CMakeLists.txt](./CMakeLists.txt)
+   in the `dev` branch - bump the version number of `CAOSDB_PROTO_VERSION` to
+   the next minor number.
+
+10. Add a new `Unreleased` section to the changelog 
+
+11. Create releases on gitlab.indiscale.com and gitlab.com