add api endpoimt to get config value

public/API/config.php

+<?php
+require "./lib/config.php";
+
+$configValue = $_GET['name'];
+
+switch ($configValue){
+    case "contactmail":
+        echo($contactmail);
+        break;
+    case "sitekey":
+        echo($sitekey);
+        break;
+    case "trackURL":
+        echo($trackurl);
+        break;
+    default:
+        echo("notFound");
+}