Merge pull request #1154 from flowforge/csv-use-case

src/_includes/core-nodes/csv-use-case.md

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+## What's the CSV node in Node-RED used for?
+
+The CSV node in Node-RED is used for processing comma-separated values (CSV) data. It allows you to either convert a CSV string into a JavaScript object or transform an object into a CSV string. This capability makes it extremely useful for reading and writing data in a tabular format.
+
+### Use Case: Calculating Energy Consumption
+
+Suppose you have a CSV file that details the energy consumption of various manufacturing stations in a factory. The file includes the station name, the month, and the total electricity consumed. You want to add a new column that displays the number of parts produced per station, based on the assumption that each part consumes a specific amount of electricity in addition to the machine's base electricity consumption.
+
+CSV Input:
+
+```
+Station,Month,Consumption
+Rio,January,4000
+New York,January,1000
+Tokio,January,3000
+```
+
+### Flow
+
+<iframe width="100%" height="200px"
+src="https://flows.nodered.org/flow/d59462dab0da277224b123205551024d/share" allow="clipboard-read; clipboard-write" style="border: none;"></iframe>