docs: update README.md with informations about the optional JS and CS…

…S files

README.md

@@ -200,6 +200,27 @@ server {
 
 Connect to the Karuta app and import the ZIP files that are into `etc/model/` in the order of file names (a number provide the order to import).
 
+#### Optional: Exporting some pages as a PDF file and traces as a ZIP file
+
+You can also import two optional files (JS and CSS) from the `etc/model/optional-export/` folder. These files are used to enable the printing functionality of certain pages and the export of traces into a ZIP file.
+This allows you to print (or export to PDF):
+
+- Each page in "Mes formations actuelles et leurs référentiels"
+- Each page in "Mes formations passées"
+- Each page in "Mon référentiel de compétences personnalisées"
+- The page "Mes traces"
+- Each page in "Mes SAé"
+- Each page in "Mes stages et alternances"
+- Each page in "Mes autres actions"
+- The page "Tableau de bord de mes compétences par formation"
+- The page "Tableau de bord compétences personnalisées"
+- Each page of "Compétences personnalisées (partie Bilan)"
+- Each page of "Bilans par compétences de la formation"
+
+This also allows you to export all the traces on the "Mes traces" page into a ZIP file. The name of the ZIP archive can be configured with the `exportTraceZipPrefix` property.
+
+To inject the files, you need to import the print.js file into `KARUTA-Configuration > KARUTA - CONFIGURATION - TECH > Fichiers Javascript > Ajouter un fichier JS`, then follow the same principle for the print.scss file by going to the `Instructions CSS et fichiers CSS` section.
+
 ## Upgrades
 
 **Before any upgrade, consider to make:**