Added 0.9.0 release notes. (#980)

docs/content/downloads/releasenotes/release-0.9.0.md

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+---
+title: "0.9.0"
+menu:
+  main:
+    parent: "ReleaseNotes"
+    weight: -90
+---
+
+* [Release log](https://projects.eclipse.org/projects/modeling.elk/releases/0.9.0)
+* [Documentation](https://download.eclipse.org/elk/updates/releases/0.9.0/elk-0.9.0-docs.zip)
+* [Update site](https://download.eclipse.org/elk/updates/releases/0.9.0/)
+* [Zipped update site](https://download.eclipse.org/elk/updates/releases/0.9.0/elk-0.9.0.zip) (for offline use)
+* [Maven central](https://repo.maven.apache.org/maven2/org/eclipse/elk/) (for building pure Java projects that use ELK)
+
+
+
+## Details
+
+This is mainly a bugfix release. See GitHub for the full [list of resolved issues](https://github.com/eclipse/elk/milestone/15?closed=1).
+
+
+### New Features and Enhancements
+
+* [#962](https://github.com/eclipse/elk/pull/962), [#914](https://github.com/eclipse/elk/pull/914): Added an experimental Depth-First and Breadth-First model order layerer.
+* [#867](https://github.com/eclipse/elk/pull/867), [#902](https://github.com/eclipse/elk/pull/902/): Added a model order layering by node promotion.
+* [#956](https://github.com/eclipse/elk/pull/956), [#942](https://github.com/eclipse/elk/pull/942), [#927](https://github.com/eclipse/elk/pull/927), [#926](https://github.com/eclipse/elk/pull/926), [#921](https://github.com/eclipse/elk/pull/921), [#893](https://github.com/eclipse/elk/pull/893), [#892](https://github.com/eclipse/elk/pull/892), [#886](https://github.com/eclipse/elk/pull/886): Added libavoid for standalone edge routing.
+* [#945](https://github.com/eclipse/elk/pull/945), [#941](https://github.com/eclipse/elk/pull/941): Added option for initial rotation of radial layout.
+* [#947](https://github.com/eclipse/elk/issues/947), [#951](https://github.com/eclipse/elk/pull/951), [#940](https://github.com/eclipse/elk/pull/940), [#936](https://github.com/eclipse/elk/pull/936), [\#932,](https://github.com/eclipse/elk/pull/932) [#843](https://github.com/eclipse/elk/pull/843): Added topdown layout and top-down rectangle packing algorithm.
+* [#939](https://github.com/eclipse/elk/pull/939), [#930](https://github.com/eclipse/elk/issues/930): Added port model order.
+* [#922](https://github.com/eclipse/elk/pull/922): KVectors now have a rotation utility method.
+* [#406](https://github.com/eclipse/elk/issues/406), [#884](https://github.com/eclipse/elk/pull/884): MrTree edge routing options + interactivity and model order.
+* [#889](https://github.com/eclipse/elk/pull/889): Added experimental bendpoints to force layout.
+* [#877:](https://github.com/eclipse/elk/pull/877) Added new model order strategy. 
+* [#834](https://github.com/eclipse/elk/pull/834), [#833](https://github.com/eclipse/elk/issues/833), [#855](https://github.com/eclipse/elk/pull/855), [#843](https://github.com/eclipse/elk/pull/843):  Support for fixed graphs for mrtree, force, stress, radial, and rectpacking.
+
+### Changes
+
+- [#973](https://github.com/eclipse/elk/pull/973), [#702](https://github.com/eclipse/elk/issues/702), [#794](https://github.com/eclipse/elk/issues/794), [#900](https://github.com/eclipse/elk/pull/900), [#807](https://github.com/eclipse/elk/issues/807): Moved from Java 8 to Java 11 while testing compliance with Java 17.
+-  [#876](https://github.com/eclipse/elk/pull/876): Renamed and reworked FORCE_MODEL_ORDER component ordering strategy to MODEL_ORDER and GROUP_MODEL_ORDER component ordering strategy.
+- [#651](https://github.com/eclipse/elk/issues/651), [#885](https://github.com/eclipse/elk/pull/885): Report invalid hierarchical cross min configuration instead of fixing it.
+- [#865](https://github.com/eclipse/elk/pull/865), [#835](https://github.com/eclipse/elk/pull/835): Restructure and improve rectpacking.
+
+
+### Bugfixes
+
+* [#957](https://github.com/eclipse/elk/pull/957): Corrected node node spacing usage for radial layout. The node node spacing is now halved and used as a padding around the nodes.
+* [#946](https://github.com/eclipse/elk/pull/946/), [#944](https://github.com/eclipse/elk/issues/944): Fix hyper edge segment splitter to actually save the best area after finding it.
+* [#850](https://github.com/eclipse/elk/issues/850), [#938](https://github.com/eclipse/elk/pull/938): Port labels no longer overlap with self loops.
+* [#918](https://github.com/eclipse/elk/issues/918), [#933](https://github.com/eclipse/elk/pull/933): Fix port model order comparator.
+* [#923](https://github.com/eclipse/elk/pull/923): Wrapping strategies do now correctly work together with model order.
+* [#906](https://github.com/eclipse/elk/pull/906), [#905](https://github.com/eclipse/elk/issues/905), [#913](https://github.com/eclipse/elk/pull/913): Fix tail edge labels.
+* [#869](https://github.com/eclipse/elk/issues/869), [#911](https://github.com/eclipse/elk/pull/911), [#868](https://github.com/eclipse/elk/issues/868):  Model order bug fixes.
+* [#870](https://github.com/eclipse/elk/issues/870): Fixed NoSuchElementException in network simplex node placer.
+* [#890](https://github.com/eclipse/elk/pull/890): Correctly check whether the layered algorithm is set.
+* [#852](https://github.com/eclipse/elk/pull/852), [#841](https://github.com/eclipse/elk/issues/841): Inline edge labels are now correctly centered (hopefully).
+* [#887](https://github.com/eclipse/elk/issues/887): Miscellaneous bug fixes.
+
+### Cleanup
+
+- [#924](https://github.com/eclipse/elk/pull/924): Corrected pom license for maven central.
+
+
+
+