Add visual instructions for headset/browser setup/demos

[cvan]

For Google Cardboard/Daydream and Samsung Internet Browser/Oculus Carmel for Gear VR, perhaps à la http://graphics.wsj.com/3d-nasdaq/:

For HTC Vive/Oculus Rift, perhaps à la https://dayandnight.moar.io/#about:

[cvan]

Also see these:

Images/screenshots of SteamVR for the HTC Vive

Videos

• https://www.youtube.com/watch?v=LRD8uQF1Z48
• https://www.youtube.com/watch?v=LRD8uQF1Z48

Guides/posts/walkthroughs

• http://venturebeat.com/2016/03/28/watch-me-set-up-the-htc-vive-for-room-scale-virtual-reality/
• http://uploadvr.com/steamvr-usage-data-room-scale/
• http://www.tomsguide.com/faq/id-3102396/set-vive-base-stations-cabled-sync.html
• http://www.tomsguide.com/faq/id-3053997/htc-vive-motion-tracking-boxes-recognized.html
• https://davidwalsh.name/vive-experience
• http://venturebeat.com/2016/03/28/watch-me-set-up-the-htc-vive-for-room-scale-virtual-reality/
• http://developer.playcanvas.com/en/user-manual/vr/types-of-vr/ (labels and describes different categories of [Web]VR experiences - no visuals though)