Add BackgroundFill objects

src/TgBotLib/Objects/Telegram/BackgroundFill/BackgroundFillSolid.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace TgBotLib\Objects\Telegram\BackgroundFill;
+
+use TgBotLib\Enums\Types\BackgroundFillType;
+use TgBotLib\Interfaces\ObjectTypeInterface;
+use TgBotLib\Objects\Telegram\BackgroundFill;
+
+class BackgroundFillSolid extends BackgroundFill implements ObjectTypeInterface
+{
+    private int $color;
+
+    /**
+     * The color of the background fill in the RGB24 format
+     *
+     * @return int
+     */
+    public function getColor(): int
+    {
+        return $this->color;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function toArray(): array
+    {
+        return [
+            'type' => $this->type->value,
+            'color' => $this->color
+        ];
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public static function fromArray(array $data): BackgroundFill
+    {
+        $object = new self();
+
+        $object->type = BackgroundFillType::SOLID;
+        $object->color = $data['color'];
+
+        return $object;
+    }
+}