feat: MAPCO-8503 Unity app with Cesium (#2)

* Add Unity version 6000.1.16f1

* Add Cesium version 1.17.0

* Add Cesium tamplate scene

* Remove unnecessary files

* Remove Sample Scene

Author: baruchInsert-tech

Assets/CesiumSettings.meta

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+  apiUrl: https://api.cesium.com
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Assets/CesiumSettings/Resources.meta

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+%YAML 1.1
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