Add RELEASES.md

Author: Son-HNguyen

RELEASES.md

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+# Release Announcements
+
+### 2.0.0 - Released [[Demo Link]](https://www.3dcitydb.org/3dcitydb-web-map/2.0.0/3dwebclient/index.html)
+
+This is a major release.
+
+##### New Features
+
+* It is now possible to add **Index 3D Scene (i3s)** and **GeoJSON** layers,
+  in addition to the existing layer types **KML/COLLADA/glTF** and **Cesium 3D Tiles**.
+
+* Existing **thematic data embedded** within the 3D layers themselves can now also be extracted and displayed,
+  in addition to the already available options to include
+  external thematic data using **PostgreSQL/PostgREST** and **Google Spreadsheets**.
+  These layers include Index 3D Scene (i3s), KML, Cesium 3D Tiles, and GeoJSON.
+
+  **Note**: Due to the inconsistent **labelling of object identifiers** in Cesium 3D Tiles from various providers,
+  the following approach was used for querying:
+    * Different identifier names are considered, such as `gml:id`, `gml_id`, `gmlid`, `gml-id`, `id`, etc.,
+      regardless whether the letters are given in uppercase or lowercase.
+    * The same also applies to the column name of the identifiers in PostgreSQL/PostgREST and Google Spreadsheets,
+      as long as the column names are valid.
+
+* In addition to embedded and PostgreSQL/PostgREST and Google Spreadsheets,
+  **OGC Feature API** is now also supported as another thematic data source.
+
+  **Note**: Due to the different implementation of the API across regions and countries,
+  the current version provides example handling of the OGC Feature API provided
+  by the German states of Hamburg and North Rhine-Westphalia.
+
+* **Web Map Tile Service (WMTS)** can now be used as another imagery or base map layer,
+  in addition to the existing **Web Map Service (WMS)**.
+
+##### Improvements
+
+* The **Graphical User Interface (GUI)** for adding and configuring layers in the toolbox have been rearranged
+  to provide more clarity and consistency. The input elements are now grouped into two groups based on their purposes:
+  **layer information** and **thematic data**, as shown below:
+
+  <img src="theme/img/gui_add_layer.png" style="display:block;float:none;margin-left:auto;margin-right:auto;">
+
+* **Mobile support for geolocation** has been completely reworked to adhere to modern security rules on personal
+  devices, especially for **iOS 13+**. The button icons and their functions are explained as follows:
+
+  <div style="display: flex; justify-content: center; align-items: center; gap: 5px;">
+    <img src="3dwebclient/images/GPS_main.png" style="width:70px">
+    <img src="3dwebclient/images/GPS_single.png" style="width:70px">
+    <img src="3dwebclient/images/GPS_on_ori.png" style="width:70px">
+    <img src="3dwebclient/images/GPS_on_pos_ori.png" style="width:70px">
+    <img src="3dwebclient/images/GPS_off.png" style="width:70px">
+  </div>
+
+  **From left to right**:
+  Default button, "snapshot" location and orientation,
+  live tracking of orientation (with fixed location), live tracking of orientation and position,
+  and button for disabling geolocation.
+
+* The **highlighting and hiding functions** have been reworked, so that objects from across different layer types
+  can be displayed correctly and consistently together.
+
+* **Cesium 3D Tiles** can now be navigated together with **Google Street View**, **Dual Map View**, etc.
+
+##### Change Logs
+
+For a complete list of all changes made for this release, please refer to the [change logs](CHANGES.md).