Add release notes page for version 0.11.0

Patrole 0.11.0 has been released [1].
This commit adds a new page for 0.11.0 release notes.

[1] https://review.opendev.org/c/openstack/releases/+/767164

Change-Id: I123cf4ad83abcbf883ac33bfb376470e71dc8ae6
2 files changed