docs: add image based pdf viewer

Author: Priestch

docs/blog/build-pdf-viewer-based-on-image.md

@@ -0,0 +1,9 @@
+# Build PDF Viewer Based on Image
+
+It's intuitive to build a PDF viewer based on images when you only got limited time and resources. This approach can be effective for simple use cases, such as displaying static documents or creating a lightweight viewer without advanced features.
+
+The PDF file format is complex, it includes lots of features like search, document-level navigation, annotations, interactive forms, digital signatures, etc. The image-based approach simplifies the rendering process by converting each page of the PDF into an image, but it also make it harder to implement advanced features.
+
+## Success Story
+
+[PSPDFKit](https://www.nutrient.io/sdk/) (now known as Nutrient), is one of the most popular commercial PDF SDK built on top of image-based rendering approach. Its creator is [Christoph Kappestein](https://twitter.com/kappeschaaf), known for Moltbot (Formerly Clawdbot).

docs/blog/how-to-develop-a-PDF-viewer.md

@@ -15,7 +15,7 @@ This article is the overview for a series: each major approach below will have i
 
 ## Four Major Ways to Develop a PDF Viewer
 
-### Based on images
+### Based on image
 
 Convert each page of the PDF into an image (e.g., PNG or JPEG) on the server side. Then, display these images in a web application using HTML `<img>` tags or a JavaScript image viewer library. This approach is relatively simple but may not provide the best user experience, especially for large documents. It's not extensible and all other features like text selection, search, annotations, etc. will be limited to what you can do with images.
 
@@ -58,3 +58,7 @@ An Open Source PDF viewer also built using PDFium Wasm. It provides a polished,
 ### Buying a commercial solution
 
 There are several commercial PDF viewer solutions available. You can see [commercial pdf viewers](/blog/3-ways-to-display-pdf-in-html#commercial-pdf-viewer).
+
+### Blog Series
+
+- [How to Build a PDF Viewer Based on Image](/blog/build-pdf-viewer-based-on-image.html)