Added serial->write numbers to support CSV data generation (#699)

* support for serial write numbers

* moving down the list

* formatting

* fixing example typo

docs/reference/serial/write-numbers.md

@@ -0,0 +1,39 @@
+# Serial Write Numbers
+
+Write an array of numbers to the [serial](/device/serial) port.
+
+```sig
+serial.writeNumbers([0, 1, 2]);
+```
+
+## Parameters
+
+* `values` is the array of [number](/types/number) to write to the serial port
+
+## Example: one two three
+
+This program repeatedly writes a 3-number array to the serial port.
+
+```blocks
+basic.forever(() => {
+    serial.writeNumbers([1, 2, 3]);
+    basic.pause(5000);
+});
+```
+
+## Example: plot temperature and light
+
+
+```blocks
+serial.writeLine("temp,light")
+basic.forever(() => {
+    serial.writeNumbers([input.temperature(), input.lightLevel()])
+})
+```
+
+## See also
+
+[serial](/device/serial),
+[serial write line](/reference/serial/write-line),
+[serial write value](/reference/serial/write-value)
+