Update README.md

Author: bluetechsky

learning_pine_roadmap/README.md

@@ -50,11 +50,16 @@ There are 4 supported versions of Pine, from 1 to 4. A compiler directive used i
 ## Pine runtime environment
 
 Pine scripts run directly in TradingView chart Editor:
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 Step 1: Go to https://www.tradingview.com/ 
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 Step 2: Open "Chart" menu (https://www.tradingview.com/chart)
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 Step 3: Click "Pine Editor" for writing Pine script.
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 ![Pine Editor] (https://www.tradingview.com/pine-script-docs/en/v4/_images/Debugging-TheLayOfTheLand-1.png)
 
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 Pine indicator code executes once for each bar of the dataset, starting from the beginning of the chart’s history. When the realtime bar is reached, *indicator* scripts execute every time price changes, while *strategy* scripts may be configured to behave like indicators, or to run only at the close of the realtime bar (the default). See [here](https://www.tradingview.com/pine-script-docs/en/v4/language/Execution_model.html) for more information.
 
 ## Series