update the Readme with PDF/SVG/Link plugin repos from SDWebImage organization

Author: dreampiggy

README.md

@@ -56,10 +56,13 @@ We support SwiftUI by building with the functions (caching, loading and animatio
 - [SDWebImageBPGCoder](https://github.com/SDWebImage/SDWebImageBPGCoder) - coder for BPG format
 - [SDWebImageFLIFCoder](https://github.com/SDWebImage/SDWebImageFLIFCoder) - coder for FLIF format
 - [SDWebImageAVIFCoder](https://github.com/SDWebImage/SDWebImageAVIFCoder) - coder for AVIF (AV1-based) format
+- [SDWebImagePDFCoder](https://github.com/SDWebImage/SDWebImagePDFCoder) - coder for PDF vector format image
+- [SDWebImageSVGCoder](https://github.com/SDWebImage/SDWebImageSVGCoder) - coder for SVG vector format image
 - and more from community!
 
 #### Loaders
 - [SDWebImagePhotosPlugin](https://github.com/SDWebImage/SDWebImagePhotosPlugin) - plugin to support loading images from Photos (using `Photos.framework`) 
+- [SDWebImageLinkPlugin](https://github.com/SDWebImage/SDWebImageLinkPlugin) - plugin to support loading images from rich link url, as well as `LPLinkView` (using `LinkPresentation.framework`) 
 
 #### Integration with 3rd party libraries
 - [SDWebImageFLPlugin](https://github.com/SDWebImage/SDWebImageFLPlugin) - plugin to support [FLAnimatedImage](https://github.com/Flipboard/FLAnimatedImage) as the engine for animated GIFs