Added logic

README.md

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+🛠 Examples
+-------------
+
+Creating a SimpleForm:
+
+```php
+$form = new SimpleForm("Sample title");
+$form->addContent("New content line");
+
+// Easiest way to add a button
+$form->addButton(new Button("Button", function (Player $pl, Button $b) {
+        $pl->sendMessage("Button clicked: " . $b->getName() . " (" . $b->getIndex() . ")");
+    }))
+
+    // Button with image
+    ->addButton((new Button("Button with image"))
+        ->setImage(ImageType::PATH, "textures/items/diamond"))
+
+    // Another way to add a button
+    ->addButton((new Button("Another button"))
+        ->setImage(ImageType::PATH, "textures/blocks/stone")
+        ->onClick(function (Player $pl, Button $b) {
+            $pl->sendMessage("Another button clicked: " . $b->getName() . " (" . $b->getIndex() . ")");
+        }));
+
+// Setting the form close handler
+$form->setCloseHandler(function (Player $pl) {
+    $pl->sendMessage("You closed the form!");
+});
+
+$form->send($player);
+```
+
+Creating a ModalForm:
+
+```php
+$form = new ModalForm("Test modal form");
+$form->addContent("New content line");
+
+$form->setPositiveButton("Positive button")
+    ->setNegativeButton("Negative button");
+
+// Setting the form handler
+// Result returns true if a positive button was ckicked and false if a negative button was ckicked
+$form->setHandler(function (Player $pl, bool $result) {
+    $pl->sendMessage("You clicked " . ($result ? "correct" : "wrong") . " button!");
+});
+
+// Setting the form close handler
+$form->setCloseHandler(fn(Player $pl) => $pl->sendMessage("You closed the form!"));
+
+$form->send($sender);
+```
+
+Creating a CustomForm:
+
+```php
+$form = new CustomForm("Test custom form");
+
+$form->addContent("Test label")
+    ->addElement("input", (new Input("Input"))
+        ->setPlaceholder("Text")
+        ->setDefaultValue("Default value"))
+    ->addElement("slider", new Slider("Slider", 1, 100, 1, 1))
+    ->addElement("stepslider", (new StepSlider("Step slider"))
+        ->addText("1")
+        ->addText("2")
+        ->addText("3"))
+    ->addElement("dropdown", (new Dropdown("Dropdown"))
+        ->addText("Element 1")
+        ->addText("Element 2")
+        ->addText("Element 3"))
+    ->addElement("dropdown1", (new Dropdown("Second dropdown"))
+        ->addElement(new SelectableElement("Option 1"))
+        ->addElement(new SelectableElement("Option 2"))
+        ->addElement(new SelectableElement("Option with value", 15)))
+    ->addElement("toggle", new Toggle("Toggle", false));
+
+// Setting the form handler
+$form->setHandler(function (Player $pl, CustomFormResponse $response) {
+    $input = $response->getInput("input")->getValue();
+
+    $slider = $response->getSlider("slider")->getValue();
+    $stepslider = $response->getStepSlider("stepslider")->getValue();
+    $dropdown = $response->getDropdown("dropdown")->getValue();
+
+    // Getting the value we set in SelectableElement
+    $dropdownValue = $response->getDropdown("dropdown1")->getValue()->getValue();
+
+    $toggle = $response->getToggle("toggle")->getValue();
+
+    $pl->sendMessage("Input: " . $input . ", Slider: " . $slider . ", Step Slider: " . $stepslider . ", Dropdown: " . $dropdown . ", Toggle: " . $toggle);
+    $pl->sendMessage("Second dropdown value: " . $dropdownValue);
+});
+
+$form->send($sender);
+```
+
+📋 Events
+-------------
+| Name                 | Cancellable | Description                      |
+|----------------------|-------------|----------------------------------|
+| PlayerFormSendEvent  | true        | Called when a form is sent       |
+| PlayerFormCloseEvent | false       | Called when the form is closed   |
+
+Example:
+```php
+public function onFormSend(PlayerFormSendEvent $event) {
+    // Getting a player
+    $player = $event->getPlayer();
+    // Getting the form
+    $form = $event->getForm();
+}
+```