chore: prepare repo for php packagist release

php/example/Example.php

@@ -0,0 +1,10 @@
+<?php
+
+require("Plugin.php");
+
+$wasm = file_get_contents("../wasm/code.wasm");
+$plugin = new Plugin($wasm);
+
+$output = $plugin->call("count_vowels", "this is an example");
+$json = json_decode(pack('C*', ...$output));
+echo "Vowels counted = " . $json->{'count'} . PHP_EOL;