added short README for project structure

README.md

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+# VR Charades Research Project
+
+## Structure
+
+- `app.apk` - VR Charades application
+- `experiment-scripts/` - Control scripts and web interface (see separate README)
+- `data-analysis/` - Analysis notebook and face/hand tracking data
+- `videos/` - Recorded experiment footage
+- `vrcharades-unity/` - Unity source code
+- `VR_Charades_Paper.pdf` - Research paper
+- `Einverstaendniserklaerungen.pdf` - Consent forms