chore(dev): Project setup

src/ContainerInterface.php

@@ -0,0 +1,10 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Testcontainers;
+
+interface ContainerInterface
+{
+    public function start(): string;
+}

src/GenericContainer.php

@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Testcontainers;
+
+class GenericContainer implements ContainerInterface
+{
+    public function start(): string
+    {
+        return 'Hello, World!';
+    }
+}

tests/GenericContainerTest.php

@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Test\Testcontainers;
+
+use PHPUnit\Framework\TestCase;
+use Testcontainers\GenericContainer;
+
+final class GenericContainerTest extends TestCase
+{
+    public function testStart(): void
+    {
+        $container = new GenericContainer();
+        $this->assertSame('Hello, World!', $container->start());
+    }
+}