Add 3.3.0-rc.1 release notes

source/releasenotes/3.3.0-rc.1.rst

+3.3.0-rc1 (2022-01-27)
+======================
+
+The first release candidate of Xbus 3.3 is ready !
+
+Changes
+-------
+
+This version introduce a new storage for envelopes, and a caching layer on top
+of it. Together they improve drastically the envelope read/write performances.
+
+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-3.3.0-rc.1-src.tar.xz
+
+version "personal":
+
+- https://dl.xbus.io/xbus/personal/xbus-3.3.0-rc.1-linux_amd64.tar.xz
+- https://dl.xbus.io/xbus/personal/xbus-3.3.0-rc.1-windows_amd64.tar.xz
+- https://dl.xbus.io/xbus/personal/xbus-3.3.0-rc.1-darwin_amd64.tar.xz
+
+Docker images
+-------------
+
+Get the docker images:
+
+version "personal":
+
+  - orus/xbusd:3.3.0-rc.1
+  - orus/xbusctl:3.3.0-rc.1
+  - orus/xbus-client:3.3.0-rc.1
+  - orus/xbus-http:3.3.0-rc.1
+  - orus/xbus-fullenv:3.3.0-rc.1

source/releasenotes/index.rst

@@ -5,6 +5,7 @@
 
 .. toctree::
 
+   3.3.0-rc.1
    3.2.9
    3.2.8
    3.2.7