Add yangtools release notes

Add a summary of changes integrated with yangtools-7.0.x

Change-Id: I887be9b00a57de7aedd6415105d82a6044403b3e
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>

diff --git a/docs/release-notes/projects/yangtools.rst b/docs/release-notes/projects/yangtools.rst
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+==========
+YANG Tools
+==========
+
+Overview
+========
+
+YANG Tools provides a set of libraries to deal with YANG models and data modeled using them.
+
+Behavior/Feature Changes
+========================
+YANG parser will no longer take into account ``extension`` statements it does not recognize
+through the appropriate support class. This may affect tools relying on our previous misguided
+attempts to interpret their meaning.
+
+YANG parser's memory efficiency has been improved by about 15% on service-provider-grade device
+models.
+
+New Features
+============
+No new features.
+
+Deprecated Features
+===================
+Code generation plugin APIs for ``yang-maven-plugin`` contained in the ``yang-maven-plugin-spi``
+artifact are deprecated and will be removed in the next major release. Their replacement live
+in maven-agnostic ``plugin-generator-api``.
+
+Resolved Issues
+===============
+The following table lists the issues resolved in this release.
+
+.. jira_fixed_issues::
+   :project: YANGTOOLS
+   :versions: 7.0.0-7.0.8
+
+Known Issues
+============
+The following table lists the known issues that exist in this release.
+
+.. jira_known_issues::
+   :project: YANGTOOLS
+   :versions: 7.0.0-7.0.8