Update README.md

README.md

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 ## Usage
 
+First time you enter you will see this screen, with no chart displayed, since the app exects you to select one of the available layers at the left panel:
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+![image](https://user-images.githubusercontent.com/9479367/56821029-a3b79a00-684d-11e9-8226-2471e32b70e7.png)
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+Click on the first layer "Candles" and wait a few second to load the data and plot the candles chart. At that point you should see something like this:
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+![image](https://user-images.githubusercontent.com/9479367/56821266-1fb1e200-684e-11e9-9492-8bcbc3ed84d8.png)
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+As you can see, the candles belong to the market BTC/USDT @ Poloniex. Even though the app already support other markets and other exchanges, for us is better to have only this one active while the codebase matures. 
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 Use your mouse wheel to zoom out and zoom in, and left click to drag and drop the charts. The Canvas App is designed to have a similar experience than Google Maps in the sense that allows you to easily navigate through different markets, potentially at different exchanges just by zooming out, dragging / dropping and zooming in at your destination.