Added readme to sample

Packages/de.jmu.ge.viavr.unitybridge/Samples~/SamplePackage/Readme.md

+# Sample Package
+
+This is a minimal example of a Unity package which provides functionality for VIA-VR. Therefore, the package must implement an interface for the VIA-VR editor to call. This interface allows package users to configure the package as they would otherwise via e.g. the Unity inspector.
+
+
+```bash
+Example Package/
+├───Package
+│   ├───Editor    // Contains both the regular Unity package editor scripts and the ExamplePackageConfigurator, which adds the required GameObject to all scenes.
+│   └───Runtime   // The regular Unity package runtime scripts.
+├───Scenes        // Exmpty example scenes to be manipulated by the package.
+└───Utils         // Provides functionality to simulate a call from the VIA-VR editor. Can be ignored.
+```
+
+See [Unity Bridge Readme](https://gitlab2.informatik.uni-wuerzburg.de/GE/Dev/ViaVR/components/via-vr-unity-bridge/-/blob/main/README.md) for more information.
+
+## How to Run
+
+Select `Unity Bridge Sample/Execute` in the Unity menu. This will simulate a call from the VIA-VR editor. The `OnConfigureScene` method will add a new GameObject to both sample scenes.
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