Add app source for F-Droid release (v1.0.11)

Adds the full Android source tree, Gradle wrapper and version catalog,
fastlane store metadata in six languages and the fdroiddata build
recipe. .gitignore now also excludes build output and keystores.
README gains build instructions and an updated structure tree.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015g6ECVSKcBG8CJPrqC3G5o

README.md

@@ -63,14 +63,30 @@ Compare the SHA-256 checksum against the value listed in [CHANGELOG.md](CHANGELO
 sha256sum Fogwawe-v1.0.10.apk
 ```
 
+## Building from source
+
+Requires JDK 17+ and Android Studio with Android SDK 37.
+
+```sh
+./gradlew assembleDebug
+```
+
+Release builds are signed only when a keystore is supplied through the `KEYSTORE_PATH`, `STORE_PASSWORD`, `KEY_ALIAS` and `KEY_PASSWORD` environment variables. Without them the release build is unsigned, which is what F-Droid expects. Keystores are excluded by `.gitignore` — never commit them.
+
+For every release: bump `versionCode` and `versionName` in `app/build.gradle.kts`, add `fastlane/metadata/android/<locale>/changelogs/<versionCode>.txt`, and tag the commit as `v<versionName>` (for example `v1.0.11`).
+
 ## Repository structure
 
 <img src="assets/icon-structure.png" width="36" align="left">
 
 ```
 .
-├── assets/              # Icon images
+├── app/                 # Android app source (Kotlin, Jetpack Compose)
+├── assets/              # README images and logos
 │   └── screenshots/     # App screenshots
+├── fastlane/            # F-Droid store listing, screenshots and changelogs
+├── fdroid/              # Build recipe for fdroiddata
+├── gradle/              # Gradle wrapper and version catalog
 ├── CHANGELOG.md         # Per-version sizes and checksums (links to GitHub Releases)
 ├── LICENSE              # GNU GPLv3
 └── README.md