chore: update README with new methods

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

README.md

@@ -38,6 +38,12 @@ With JSignPDF bin:
 ```php
 $param->setjSignPdfJarPath('/path/to/jsignpdf');
 ```
+With specific Java or JSignPdf version:
+```php
+$params->getJSignPdfDownloadUrl('the url to download the zip here');
+$params->setJavaDownloadUrl('the url to download the .tar.gz here');
+$params->setJavaVersion('openjdk version "21.0.8" 2025-07-15 LTS')
+```
 
 Without JSignPDF bin:
 ```bash