docs: add French documentation

README.md

@@ -2,6 +2,8 @@
 
 Install free Android apps via ADB from F-Droid, GitHub Releases, GitLab Releases, Codeberg Releases, or generic HTTPS pages.
 
+[Français](README.fr.md)
+
 ## Requirements
 
 - Python 3.11+
@@ -31,6 +33,13 @@ sideload [APP] [--list] [--update-all] [--device SERIAL] [--dry-run] [--config P
   installed apps whose remote APK has a greater `versionCode` (incompatible with `APP` and `--list`)
 - `--config`, `-c` — path to config.toml (default: ./config.toml)
 
+`--update-all` selects the ADB device once, then checks every configured package with
+`adb shell dumpsys package`. Apps that are not installed are reported and skipped without
+downloading anything. Installed apps are updated only when the validated remote APK has a
+strictly greater `versionCode`; equal or lower versions are skipped. Errors for one app do
+not stop the other apps, and the command prints a summary and returns a non-zero status if
+an update failed.
+
 ## Configuration
 
 See `config.example.toml`. Supported sources:
@@ -39,7 +48,7 @@ See `config.example.toml`. Supported sources:
 | -------- | ---------------------------- |
 | `fdroid` | `url` (page F-Droid)          |
 | `github` | `url` (repository)            |
-| `gitlab` | `url` (projet)                |
+| `gitlab` | `url` (project)               |
 | `codeberg` | `url` (repository Codeberg) |
 | `generic` | `url`, `asset_pattern` (HTTPS page or directory) |
 
@@ -58,6 +67,9 @@ pattern with numeric capture groups selects the greatest numeric tuple.
 must be available in `PATH`. The script refuses to install an APK when neither
 tool can validate it.
 
+For `--update-all`, `aapt2 dump badging` (with `aapt dump badging` fallback) also reads the
+remote APK `versionCode` before deciding whether an installation is needed.
+
 For Wi-Fi ADB, configure an explicit address after enabling wireless debugging:
 
 ```toml