Add 3.4.0-rc.7 release notes

source/releasenotes/3.4.0-rc.7.rst

+3.4.0-rc.7 (2024-08-01)
+=======================
+
+Changes
+-------
+
+- fix a crash in service director
+
+Documentation
+-------------
+
+Documentation is online:
+
+  https://docs.xbus.io/
+
+Downloads
+---------
+
+Source and binaries are available on our download area:
+
+- https://dl.xbus.io/xbus/src/xbus-3.4.0-rc.7-src.tar.xz
+
+version "personal":
+
+- https://dl.xbus.io/xbus/personal/xbus-3.4.0-rc.7-linux_amd64.tar.xz
+- https://dl.xbus.io/xbus/personal/xbus-3.4.0-rc.7-windows_amd64.tar.xz
+- https://dl.xbus.io/xbus/personal/xbus-3.4.0-rc.7-darwin_amd64.tar.xz
+
+Docker images
+-------------
+
+Get the docker images:
+
+version "personal":
+
+  - orus/xbusd:3.4.0-rc.7
+  - orus/xbusctl:3.4.0-rc.7
+  - orus/xbus-client:3.4.0-rc.7
+  - orus/xbus-http:3.4.0-rc.7
+  - orus/xbus-fullenv:3.4.0-rc.7