Šepot — end-to-end encrypted messenger

Initial public release. Anonymous on-device identity (no phone number,
e-mail, or password), Signal-protocol cryptography (X3DH + PQXDH, Double
Ratchet, sealed sender) via libsignal, a metadata-minimizing relay,
group chats, disappearing messages, encrypted local storage, optional
Tor transport, and a UI localized into Czech, English, German, Russian,
and Italian.

Monorepo: Flutter client (app/), Rust relay + wire types (rust/),
protobuf definitions (proto/), self-host deploy (deploy/).

Licensed under AGPL-3.0 with an app-store distribution exception (§7).

app/README.md

@@ -0,0 +1,28 @@
+# Šepot — Flutter client
+
+The Šepot mobile client. See the [repository README](../README.md) for the
+project overview, threat model, and license.
+
+## Quick start
+
+```bash
+flutter pub get
+flutter run                       # against the default relay
+flutter build apk --release       # signed release APK (see key.properties)
+```
+
+## Layout
+
+| Path | Contents |
+|---|---|
+| `lib/core/` | Crypto facade, storage (SQLCipher), relay client + transport, push, services |
+| `lib/features/` | Screens (onboarding, chat, contacts, groups, settings, safety…) |
+| `lib/models/` `lib/providers/` | Data models and Riverpod providers |
+| `lib/l10n/` | Localization (`app_*.arb`, generated `AppLocalizations`) |
+| `test/` `integration_test/` | Unit, storage, crypto, and on-device integration tests |
+
+## Localization
+
+Strings are defined in `lib/l10n/app_cs.arb` (template) and translated into
+`app_en/de/ru/it.arb`. After editing, run `flutter gen-l10n`. See the root
+README for how to contribute a new language.