Enhance examples /w environment variables

examples/checkcredentials.php

@@ -2,8 +2,12 @@
 
 require_once ('common.php');
 
-$username = 'username';
-$password = 'password';
+if (count($argv)!=3) {
+    echo "Please pass 2 parameters to check: username and password\n";
+    exit();
+}
+$username = $argv[1];
+$password = $argv[2];
 
 if ($client->checkCredentials($username, $password)) {
     echo "CREDENTIALS OK\n";

examples/common.php

@@ -0,0 +1,16 @@
+<?php
+
+require_once (__DIR__ . '/../vendor/autoload.php');
+
+use UserBase\Client\Client;
+
+$baseUrl = 'http://127.0.0.1:8888/api/v1';
+$username = getenv('USERBASE_CLIENT_USERNAME');
+$password = getenv('USERBASE_CLIENT_PASSWORD');
+
+if (!$username || !$password) {
+    echo "Environment variables not yet properly configured\n";
+    exit();
+}
+
+$client = new Client($baseUrl, $username, $password);