added new example template and instructions on how to create more

examples/README.md

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+## Running an example
+
+From the examples folder, run:
+`php your_example.php`
+
+## Adding a new example
+
+1. Clone new_example.php
+2. Implement your example
+3. Run it (as per above)
+4. 👍

examples/meter_event_stream.php

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+<?php
+
+require 'vendor/autoload.php'; // Make sure to include Composer's autoload file
+
+use Stripe\StripeClient;
+
+class MeterEventManager
+{
+    private $apiKey;
+    private $meterEventSession;
+
+    public function __construct($apiKey)
+    {
+        $this->apiKey = $apiKey;
+        $this->meterEventSession = null;
+    }
+
+    private function refreshMeterEventSession()
+    {
+        // Check if session is null or expired
+        if (
+            $this->meterEventSession === null ||
+            $this->meterEventSession->expires_at <= time()
+        ) {
+            // Create a new meter event session in case the existing session expired
+            $client = new \Stripe\StripeClient($this->apiKey);
+            $this->meterEventSession = $client->v2->billing->meterEventSession->create();
+        }
+    }
+
+    public function sendMeterEvent($meterEvent)
+    {
+        // Refresh the meter event session, if necessary
+        $this->refreshMeterEventSession();
+
+        // Create a meter event with the current session's authentication token
+        $client = new \Stripe\StripeClient($this->meterEventSession->authentication_token);
+        $client->v2->billing->meterEventStream->create([
+            'events' => [$meterEvent],
+        ]);
+    }
+}
+
+// Usage
+$apiKey = "{{API_KEY}}";
+$customerId = "{{CUSTOMER_ID}}";
+
+$manager = new MeterEventManager($apiKey);
+$manager->sendMeterEvent([
+    'event_name' => 'alpaca_ai_tokens',
+    'payload' => [
+        'stripe_customer_id' => $customerId,
+        'value' => '26',
+    ],
+]);

examples/new_example.php

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+<?php
+
+// require 'vendor/autoload.php'; // Make sure to include Composer's autoload file
+require '../init.php';
+
+use Stripe\StripeClient;
+
+class NewExample
+{
+    private $apiKey;
+
+    public function __construct($apiKey)
+    {
+        $this->apiKey = $apiKey;
+    }
+
+    public function doSomethingGreat()
+    {
+        print("Hello World\n");
+        // $client = new \Stripe\StripeClient($this->apiKey);
+    }
+}
+
+// Usage
+$apiKey = "{{API_KEY}}";
+
+$example = new NewExample($apiKey);
+$example->doSomethingGreat();