Add release notes page for version 0.7.0

Patrole 0.7.0 has been released [1].
This commit adds a new page for 0.7.0 release notes.

[1] https://review.opendev.org/#/c/685430/

Change-Id: I8420471c70abd17846529710100bf834581e41b0
diff --git a/releasenotes/source/index.rst b/releasenotes/source/index.rst
index a51c1e4..543561f 100644
--- a/releasenotes/source/index.rst
+++ b/releasenotes/source/index.rst
@@ -6,6 +6,7 @@
    :maxdepth: 1
 
    unreleased
+   v0.7.0
    v0.6.0
    v0.5.0
    v0.4.0
diff --git a/releasenotes/source/v0.7.0.rst b/releasenotes/source/v0.7.0.rst
new file mode 100644
index 0000000..a63fa04
--- /dev/null
+++ b/releasenotes/source/v0.7.0.rst
@@ -0,0 +1,6 @@
+=====================
+v0.7.0 Release Notes
+=====================
+
+.. release-notes:: 0.7.0 Release Notes
+   :version: 0.7.0