Simple doc.

docs/module_linenoise.md

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+# linenoise module
+User input from console (stdin/stdout). Useful for interactive commands with
+editing and line history. It's a modified version of the esp-idf copy of
+linenoise written by someone else (see the attribution in module_linenoise.c).
+
+We need to poll to give it a chance to process user input. The poll function
+will return a complete string once one has been typed.
+
+## Example:
+
+if(true) {
+	var linenoise = require('linenoise');
+	linenoise.setPrompt('test> ');
+	setInterval(function() {
+		var line = linenoise.poll();
+		if(line!==undefined) linenoise.print(line);
+	}, 20);
+}