Merge branch 'ros2' into add/doc_backport_tool

Signed-off-by: Christian Henkel <[email protected]>

README.md

@@ -55,6 +55,17 @@ Use this command to port a given PR of `PR_NUMBER` to the other branches:
 backport --pr PR_NUMBER -b ros2-humble ros2-iron ros2-jazzy
 ```
 
+# Versioning and Releases
+
+- (__X__.0.0) We use the major version number to indicate a breaking change.
+- (0.__Y__.0) The minor version number is used to differentiate between different ROS distributions:
+ - x.__0__.z: Humble Hawksbill
+ - x.__1__.z: Iron Irwini
+ - x.__2__.z: Jazzy Jalisco
+ - x.__3__.z: Rolling Ridley
+ - Future releases (Kilted Kaiju 05/25) will get x.__3__.z and _Rolling_ will be incremented accordingly.
+- (0.0.__Z__) The patch version number is used for changes in the current ROS distribution that do not affect the API.
+
 # License
 
 The source code is released under a [BSD 3-Clause license](LICENSE).