Update README.md

README.md

 # x3dom-x3d-viewer
 Javascript viewer for X3D models
 
+## Demo
+[Elphel's cameras assemblies](https://wiki.elphel.com/wiki/Elphel_camera_assemblies). Click on images.
+
 ## Features
-* Based on [X3DOM](https://www.x3dom.org/) JS library
+
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+## Notes
+* Extracted from [[freecad_x3d](https://git.elphel.com/Elphel/freecad_x3d)
+* To convert STEP models and assemblies - use **x3d_step_assy.py** from *freecad_x3d*
+* Based on [X3DOM](https://www.x3dom.org/) JS library v1.7.2
+
+## Support
+Public mailing list: support-list@support.elphel.com
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