Functional Mode sombre and Télécharger buttons

app/src/main/AndroidManifest.xml

app/src/main/assets/tuto.pdf

...src/main/java/com/example/myapplication/HomeActivity.java

...src/main/java/com/example/myapplication/MainActivity.java

...c/main/java/com/example/myapplication/PublicActivity.java

...src/main/java/com/example/myapplication/SettingsPage.java

...main/java/com/example/myapplication/TutorialActivity.java

app/src/main/res/drawable/polygon_10.png

app/src/main/res/layout/fragment_settings_page.xml

app/src/main/res/values-night/themes.xml

app/src/main/res/values/strings.xml

app/src/main/res/values/themes.xml

app/src/main/res/xml/file_paths.xml