Initial commit — SyncFlow Android file sync app

Supports WebDAV, SFTP, SFTPGo, Nextcloud, ownCloud, Google Drive,
Dropbox, and OneDrive. Credentials encrypted with Android Keystore.
Biometric app-lock, conflict resolution, and auto-sync via WorkManager.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

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+# SyncFlow
+
+Native Android file sync app — sync any folder to WebDAV, SFTP, Nextcloud, ownCloud, Google Drive, Dropbox, or OneDrive.
+
+## Features
+
+- **Multi-provider** — WebDAV, SFTP, SFTPGo, Nextcloud, ownCloud, Google Drive, Dropbox, OneDrive
+- **Flexible sync** — one-way upload, one-way download, or two-way mirror
+- **Auto-sync** — schedule by interval or trigger on Wi-Fi connect / device charge
+- **Conflict resolution** — keep local, keep remote, keep newer, or keep both
+- **Secure** — credentials encrypted with Android Keystore; biometric app-lock option
+- **No cloud dependency** — runs fully on-device, no third-party relay
+
+## Install
+
+1. Download `SyncFlow.apk` from the [latest release](../../releases/latest)
+2. On your Android phone: **Settings → Apps → Install unknown apps** → allow your browser/file manager
+3. Open the downloaded APK and tap Install
+4. Open **SyncFlow**, go to **Accounts** tab → **Add Account**, pick your provider and sign in
+5. Tap **+** on the **Syncs** tab to create your first sync pair
+
+## Supported Providers
+
+| Provider | Auth |
+|---|---|
+| WebDAV | Username + password |
+| SFTP | Password or private key |
+| SFTPGo | Username + password |
+| Nextcloud | Username + password |
+| ownCloud | Username + password |
+| Google Drive | OAuth 2.0 (PKCE) |
+| Dropbox | OAuth 2.0 (PKCE) |
+| OneDrive | OAuth 2.0 (PKCE) |
+
+## Requirements
+
+- Android 8.0+ (API 26)
+- Storage permission (or SAF picker) for local folder access