Add release notes for Luigi v1.20 (SAP#2459)

blog/2021-12-23-release-notes.md

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+---
+title: Luigi v1.20.0
+seoMetaDescription: Release notes for Luigi v1.20.0
+author:
+  - Aleksandra Simeonova
+layout: blog
+---
+
+You can read about the new features in Luigi v1.20.0 in the release notes below.
+
+<!-- Excerpt -->
+
+#### New SAP icon styles support
+
+In addition to basic SAP icons, Luigi now supports the use of different SAP Icon suites like TNT and businessSuiteInAppSymbols.
+In order to use these icons, it is recommended to add `@font-face` from the [Fundamental Styles](https://sap.github.io/fundamental-styles/?path=/docs/introduction-overview--page#project-configuration) project configuration to your **custom styles**. You can find more information [here](https://github.com/SAP/luigi/pull/2432).
+
+#### Global search improvements
+
+We added two new parameters related to our [global search](https://docs.luigi-project.io/docs/navigation-parameters-reference/?section=global-search): [globalSearchCenteredCancelButton](https://docs.luigi-project.io/docs/navigation-parameters-reference/?section=globalsearchcenteredcancelbutton) and [searchFieldCentered](https://docs.luigi-project.io/docs/navigation-parameters-reference/?section=searchfieldcentered).
+
+When the `searchFieldCentered` boolean is set to `true`, the search input field in Luigi will be rendered in the center of the shellbar.
+
+You can use `globalSearchCenteredCancelButton` to define the label of the cancel button. It will be displayed if you want to hide the search field on a smaller viewport. This property is only available if `searchFieldCentered` is active.
+
+#### Dynamic pathSegment for breadcrumbs and navheader
+
+As of Luigi 1.20, [dynamic pathSegments](https://docs.luigi-project.io/docs/navigation-advanced/?section=dynamic-path-parameters) are also available for breadcrumbs and navheader. You can find more information [here](https://github.com/SAP/luigi/pull/2370).
+
+#### Parameter handlers improvements
+
+In Luigi 1.20, we added an optional boolean argument called `keepBrowserHistory` to [addCoreSearchParams](https://docs.luigi-project.io/docs/luigi-client-api/?section=addcoresearchparams). It allows for the change of params without an additional browser history entry.
+We also added a function to manipulate current node parameters called [addNodeParams](https://docs.luigi-project.io/docs/luigi-client-api/?section=addnodeparams) which provides the same functionality. It gives you the option to keep browser history or not. You can find more information [here](https://github.com/SAP/luigi/pull/2409).
+
+#### Bugfixes
+
+For a full list of bugfixes in this release, see our [changelog](https://github.com/SAP/luigi/blob/master/CHANGELOG.md).
+