[DOCS] Release notes 2.2.x

Author: j143

_src/release-notes/systemds-release-notes-2.2.x.md

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+---
+layout: page
+title: SystemDS 2.2.0 Release Notes
+description: Project Release Notes
+group: nav-right
+---
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+<section class="full-stripe full-stripe--subpage-header clear-header">
+  <div class="ml-container ml-container--horizontally-center">
+    <div class="col col-12 content-group content-group--center-content content-group--center-align">
+      <h1>{{ site.data.project.name }} 2.2.x Release Notes</h1>
+    </div>
+  </div>
+</section>
+
+<section class="full-stripe full-stripe--alternate">
+  <div class="ml-container">
+    <div class="col col-12 content-group content-group--medium-bottom-margin" markdown="1">
+
+## Release notes for SystemDS 2.2.2
+
+SystemDS 2.2.x is a minor release. This release contains major improvements to existing features,
+a large number of performance and robustness fixes, and some experimental features to better
+support the end-to-end data science lifecycle. In addition to that, this is the last release
+with Java 8 and Spark 2.x.
+
+SECURITY NOTICE: This release and the above versions include fix for the CVE-2022-26477 (link: https://nvd.nist.gov/vuln/detail/CVE-2022-26477).
+
+The major changes (compared to SystemDS 2.1) include:
+
+- Federated Backend: Extended operations and built-ins to support various workflows and algorithms.
+- Full support for compressed linear algebra.
+- Full support for multithreaded feature transformation.
+- Various performance improvements to existing builtins in SystemDS's local, distributed, and native runtimes.
+- Performance and robustness fixes for eval. Parfor support for eval.
+- Robust performance test suite.
+- Asynchronous triggering of spark operations via prefetch and broadcast
+- New feature: Generating custom readers by example [experimental]
+- Robust release automation scripts with dry-run support.
+- Miscellaneous Improvements: Improved documentation, better testing, Python API, GPU backend.