feat: main upload of v2.0.0 version

Closes #3

src/Action.php

@@ -0,0 +1,90 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+* This file is part of https://github.com/josantonius/php-hook repository.
+*
+* (c) Josantonius <hello@josantonius.dev>
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+namespace Josantonius\Hook;
+
+/**
+ * Action hook instance.
+ */
+class Action
+{
+    /**
+     * If the action was done.
+     */
+    private bool $done = false;
+
+    /**
+     * Callback result.
+     */
+    private mixed $result = null;
+
+    /**
+     * Create new action instance.
+     */
+    public function __construct(
+        private $callback,
+        private int $priority,
+        private bool $once
+    ) {
+    }
+
+    /**
+     * Gets action callback.
+     */
+    public function getCallback(): callable
+    {
+        return $this->callback;
+    }
+
+    /**
+     * Gets action priority.
+     */
+    public function getPriority(): int
+    {
+        return $this->priority;
+    }
+
+    /**
+     * Gets callback result.
+     */
+    public function getResult(): mixed
+    {
+        return $this->result;
+    }
+
+    /**
+     * True if the action is called only once and deleted.
+     */
+    public function isOnce(): bool
+    {
+        return $this->once;
+    }
+
+    /**
+     * Run action callback.
+     */
+    public function runCallback(...$arguments): void
+    {
+        $this->result = $this->getCallback()(...$arguments);
+
+        $this->done = true;
+    }
+
+    /**
+     * If the action has already been done.
+     */
+    public function wasDone(): bool
+    {
+        return $this->done === true;
+    }
+}

src/Exceptions/HookException.php

@@ -0,0 +1,23 @@
+<?php
+
+/*
+ * This file is part of https://github.com/josantonius/php-hook repository.
+ *
+ * (c) Josantonius <hello@josantonius.dev>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Josantonius\Hook\Exceptions;
+
+/**
+ * Hook exception manager.
+ */
+class HookException extends \Exception
+{
+    public function __construct(string $message = 'Unknown error')
+    {
+        parent::__construct(rtrim($message, '.') . '.');
+    }
+}