Add project README with setup and usage instructions

LICENSE

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LICENSE-MIT

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+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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+copies or substantial portions of the Software.
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+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# bdk-dart
+
+Dart bindings for the [Bitcoin Dev Kit (BDK)](https://bitcoindevkit.org/) wallet library.
+The repo packages the generated UniFFI bindings (`lib/bdk.dart`) together with the
+compiled `libbdkffi` native library so Dart and Flutter apps can work with descriptor-based
+wallets, key management utilities, and blockchain backends from BDK.
+
+## Repository layout
+
+| Path | Purpose |
+| ---- | ------- |
+| `bdk-ffi/` | Rust sources and build scripts for the underlying `bdk-ffi` crate. |
+| `lib/` | Generated Dart bindings (`bdk.dart`) produced by UniFFI-Dart. |
+| `examples/` | Standalone Dart examples that exercise common workflows. |
+| `test/` | Integration-style tests that cover wallet creation, persistence, and networking. |
+| `bdk_demo/` | Flutter sample app you can point at mobile targets once the bindings are built. |
+| `scripts/generate_bindings.sh` | Helper used to rebuild the native library and regenerate the Dart bindings. |
+
+## Prerequisites
+
+To build the bindings locally you need:
+
+- Dart SDK 3.2 or newer (see `pubspec.yaml`).
+- Rust toolchain with `cargo` and the native targets you intend to build.
+- `clang`/`lld` (or equivalent platform toolchain) for producing the shared library.
+- Flutter (optional) if you plan to run `bdk_demo`.
+
+Make sure submodules are cloned because the Rust crate lives in `bdk-ffi/`:
+
+```bash
+git clone --recurse-submodules https://github.com/bitcoindevkit/bdk-dart.git
+cd bdk-dart
+```
+
+## Installation
+
+1. Install dependencies:
+   ```bash
+   dart pub get
+   ```
+2. Generate the Dart bindings and native binary:
+   ```bash
+   ./scripts/generate_bindings.sh
+   ```
+   The script builds `bdk-ffi`, runs the local `uniffi-bindgen` wrapper, and drops the
+   resulting `libbdkffi.*` alongside the freshly generated `lib/bdk.dart`.
+3. Make sure the produced library is discoverable at runtime. For CLI usage you can export
+   `LD_LIBRARY_PATH`/`DYLD_LIBRARY_PATH` or keep the binary in the same directory as your
+   Dart entrypoint.
+
+## Usage
+
+After generating the bindings you can run the examples or consume the package from your
+own project. For instance, the `examples/network_example.dart` walkthrough shows how to:
+
+1. Create a new mnemonic and derive BIP84 descriptors.
+2. Instantiate a wallet backed by the in-memory persister.
+3. Reveal addresses and persist staged changes.
+4. Optionally sync with Electrum over TLS.
+
+Run it with:
+
+```bash
+dart run examples/network_example.dart
+```
+
+When embedding in Flutter, add a path or git dependency on this package and ensure the
+native library is bundled per target platform (e.g., via `flutter_rust_bridge`-style
+build steps or platform-specific build scripts).
+
+## Testing
+
+Once `lib/bdk.dart` and the native library are available you can execute the Dart test
+suite, which covers wallet creation, persistence, offline behavior, and descriptor APIs:
+
+```bash
+dart test
+```
+
+## License
+
+The Rust crate and generated bindings are dual-licensed under MIT or Apache 2.0 per the
+`license = "MIT OR Apache-2.0"` entry in `Cargo.toml`. You may choose either license when
+using the library in your project.