added streaming page

docs/streaming.md

@@ -0,0 +1,32 @@
+# Streaming
+
+This page describes how to stream data from the micro:bit to the editor or even to the cloud.
+
+## Before starting...
+
+Make sure you follow the instructions on [how to setup a serial connection](/device/serial) with the micro:bit. 
+
+## A typical scenario
+
+A common scenario is to chart some sensor data, such as the acceleration, and analyse it in the editor. 
+For example, run this code on your micro:bit.
+
+```blocks
+basic.forever(() => {
+   led.plotBarGraph(input.acceleration(Dimension.X), 0);
+});
+```
+
+If your serial connection is working, you will start to see a chart representing that acceleration ``x`` value read from the micro:bit.
+Each time ``led.plotBarGraph`` is called, the value is also written to the serial output. The log view automatically detects 
+that there is a data stream and displays a graph.
+
+## Local download
+
+The log view will automatically start to collect and organize the data it detects. Simply click on the log view to open the various options
+to export the data. The simplest option is to download the data as a **CSV file**. This file can easily be opened in programs like Office Excel.
+
+## Cloud upload
+
+In the data export dialog, there is another option to upload the data to the cloud. This allows to upload small amounts of data 
+without any kind setup. The data can be accessed via web services or directly from Office Excel.