doc: update document.

README.md

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 ![Iconed 4](./assets/screenshots-4.png)
 
-Create and personalize icons from images, supporting macOS/iOS icon generation, folder icon creation, and setting.
+Easily create and personalize icons from images, supporting macOS and iOS icon generation, folder icon creation and setting, and providing icon format conversion features.
 
-- **Folder Icons**: Quickly customize and set your folder icons.
-- **App Icons**: Supports all operating systems, helping you import any image and convert it into a complete, usable app icon. Compatible with various icon formats required by Apple platforms (iOS and macOS).
-- **Icon Format Conversion**: Easily convert icons to other formats to meet the needs of different platforms.
+- **Folder Icons**: Quickly customize and set your folder icons with simple operations, making your folders more personalized and unique.
+- **App Icons**: Compatible with all operating systems, supporting the import of any image and converting it into a complete, usable app icon. Specifically tailored for Apple platforms (iOS and macOS), supporting various required icon formats to meet different application scenarios.
+- **Icon Format Conversion**: Easily convert icons to other formats, supporting common icon formats such as PNG, JPEG, TIFF, etc., making it convenient to switch between different platforms.
 
-This tool helps you create any type of icon for your application, converting images into the required 1x, 2x (retina), and 3x formats, and generating corresponding image sets.
+This tool helps you create any type of icon for your application, automatically converting it to the required 1x, 2x (retina), and 3x formats, and generating a complete image set to ensure perfect display on all devices and resolutions.

README.zh.md

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 ![Iconed 4](./assets/screenshots-4.png)
 
-从图片创建和个性化图标，支持 macOS/iOS 图标生成，文件夹图标生成及设置。
+轻松从图片创建和个性化图标，支持 macOS 和 iOS 图标生成、文件夹图标创建与设置，并提供图标格式转换功能。
 
-- **文件夹图标**：快速自定义和设置您的文件夹图标。
-- **应用程序图标**：支持所有操作系统，帮助您导入任何图像并转换为完整、可用的应用程序图标。兼容 Apple 平台（iOS 和 macOS）所需的各种图标格式。
-- **图标格式转换**：轻松将图标转换为其他格式，满足不同平台的需求。
+- **文件夹图标**：通过简单的操作，快速自定义并设置您的文件夹图标，让您的文件夹更加个性化和独特。
+- **应用程序图标**：兼容所有操作系统，支持将任意图像导入并转换为完整、可用的应用程序图标。特别适配 Apple 平台（iOS 和 macOS），支持各种所需图标格式，满足不同应用场景。
+- **图标格式转换**：轻松将图标转换为其他格式，支持常见的图标格式，如 PNG、JPEG、TIFF 等，方便您在不同平台间切换使用。
 
-该工具可以帮助您为应用程序创建任何类型的图标，将图像转换为所需的 1x、2x（视网膜）和 3x 格式，并生成相应的图像集。
+该工具能帮助您为应用程序创建任何图标，自动转换为所需的 1x、2x（视网膜）和 3x 格式，并生成完整的图像集，确保在所有设备和分辨率下都能完美显示。