Added init command, improved plugin api

src/Commands/InitCommand.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace Spark\Commands;
+
+use Symfony\Component\Console\Attribute\AsCommand;
+use Spark\Commands\Command;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+
+#[AsCommand(name:'init', description:'Initialize a new spark in the current directory')]
+class InitCommand extends Command
+{
+    protected function configure()
+    {
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $configDir = getcwd()."/.spark";
+        if (is_dir($configDir)) {
+            $output->writeln("<notice>Spark already initialized?</>");
+            return Command::FAILURE;
+        }
+
+        mkdir($configDir);
+        mkdir($configDir."/plugins");
+        file_put_contents($configDir."/spark.json", json_encode([
+            'preload' => [
+                './.spark/plugins/*'
+            ],
+            'scripts' => [
+                'hello' => "echo 'Hello World\n'"
+            ]
+        ], JSON_PRETTY_PRINT|JSON_UNESCAPED_SLASHES));
+
+        $output->writeln("<fg=green>Initialized new spark in ".getcwd()."/.spark</>");
+
+        return Command::SUCCESS;
+    }
+}