Add screenshots to readme

[matthewgiarra]

It's a visualization library. It would be nice to see some examples of what its visualizations actually look like. The examples page doesn't appear to show any either.

The main readme would be the natural place for some screen shots. Could you add a couple?

[stevenlovegrove]

You're right, the live samples I have up aren't very easy to find, a screenshot would be good.

If you follow the links on that examples page you linked, you get interactive programs compiled for web, e.g.

https://stevenlovegrove.github.io/Pangolin/emscripten/examples/SimpleDisplay/ https://stevenlovegrove.github.io/Pangolin/emscripten/examples/SimplePlot/ ...