added testing PHP file

testing.php

@@ -0,0 +1,31 @@
+<?php
+/*
+
+This file is intended to be a testing ground in case
+you want to adjust the parameters of these charts.
+That way you can make lots of changes without
+hammering Poloniex half to death.
+
+*/
+
+
+ini_set('display_errors', 1);
+//include 'buffer.php';
+
+Header('Content-type: image/svg+xml; charset=utf-8');
+
+spl_autoload_register(function ($class_name) {
+    include $class_name . '.php';
+});
+
+$chartData = [];
+
+$start = 0.01;// * rand()/getRandMax();
+$volatility = 0.002;
+
+for ($n = 0, $current = $start; $n < 50; $n++) {
+  $current += $volatility * (rand()/getRandMax() - 0.5)**3;
+  $chartData[$n] = $current;
+}
+
+print SVGChartBuilder::renderStockChart($chartData);