Add "Processing Methods Under PixInsight"

README.md

@@ -160,6 +160,7 @@ Contributions are welcome. Please read the [contributing guideline](CONTRIBUTING
 - [Nikon DSLR models matrix](https://www.astrophotography.app/nikon.php) - A list of Nikon models with useful reference information such as sensor and pixel size, quantum efficiency, shutter life, etc.
 - [Online Narrowband RGB Combination Preview Tool](https://web.archive.org/web/20240928205042/https://www.bintel.com.au/narrowband-preview-tool/index.php) - This tool allows you to upload black and white source images (filtered eg. Ha, Sii, Oiii or R, G, B), then shows every possible permutation for the various combinations/palettes.
 - [Photons to Photos](https://www.photonstophotos.net) - Interactive charts with sensor data contributed by people around the world.
+- [Processing Methods Under PixInsight](https://astro-photographie.fr/traitement_pixinsight.html) - An extensive collection of workflow diagrams for image processing in PixInsight. It covers both one-shot and monochrome cameras. A great resource for beginners and advanced users alike.
 - [Rouzastro equipment reviews](https://rouzastro.com/reviews/) - A growing list of equipment reviews. The experiences and results may prove useful for those looking at new gear.
 - [Sharpless](http://www.sharplesscatalog.com/sharpless.aspx) - Images of all objects from the Sharpless catalogue each with capture and background information.
 - [The 750 Best Deep Sky Objects (Reachable from the Northern Hemisphere)](https://www.astrobin.com/8cawy6/) - A simplified tool to help astrophotographers easily find targets on any night of the year.