docs: update document

Author: zhzLuke96

README.md

@@ -7,7 +7,9 @@ Publish 1 page tools using github pages
 | page | project | source |
 | --- | --- | --- |
 | [Markdown & LaTeX Preview](https://lenml.github.io/page-tools/mathjax-md-preview) | mathjax-md-preview | [source](https://github.com/lenml/page-tools/tree/main/pages/mathjax-md-preview) |
+| [MP4 Player](https://lenml.github.io/page-tools/mp4player) | mp4player | [source](https://github.com/lenml/page-tools/tree/main/pages/mp4player) |
 | [PDF to Markdown Converter](https://lenml.github.io/page-tools/pdf2md) | pdf2md | [source](https://github.com/lenml/page-tools/tree/main/pages/pdf2md) |
+| [Text Diff Tool](https://lenml.github.io/page-tools/textdiff) | textdiff | [source](https://github.com/lenml/page-tools/tree/main/pages/textdiff) |
 
 # LICENSE