Add file-parser-pdf-url.ts documentation to README

Include both examples with running instructions as suggested by Copilot review.

Author: subtleGradient

typescript/ai-sdk-v5/src/plugin-file-parser/README.md

@@ -12,10 +12,15 @@ The FileParserPlugin is automatically enabled when using file attachments with t
 
 ## Examples
 
+- `file-parser-pdf-url.ts` - Demonstrates sending PDFs via public URLs without downloading
 - `file-parser-all-sizes.ts` - Tests PDF processing across multiple file sizes
 
 ## Running
 
 ```bash
+# Test all PDF sizes
 bun run typescript/ai-sdk-v5/src/plugin-file-parser/file-parser-all-sizes.ts
+
+# Demo PDF URL processing
+bun run typescript/ai-sdk-v5/src/plugin-file-parser/file-parser-pdf-url.ts
 ```