Add comprehensive documentation and examples for Owlen architecture and usage

- Include detailed architecture overview in `docs/architecture.md`.
- Add `docs/configuration.md`, detailing configuration file structure and settings.
- Provide a step-by-step provider implementation guide in `docs/provider-implementation.md`.
- Add frequently asked questions (FAQ) document in `docs/faq.md`.
- Create `docs/migration-guide.md` for future breaking changes and version upgrades.
- Introduce new examples in `examples/` showcasing basic chat, custom providers, and theming.
- Add a changelog (`CHANGELOG.md`) for tracking significant changes.
- Provide contribution guidelines (`CONTRIBUTING.md`) and a Code of Conduct (`CODE_OF_CONDUCT.md`).

docs/faq.md

@@ -0,0 +1,42 @@
+# Frequently Asked Questions (FAQ)
+
+### What is the difference between `owlen` and `owlen-code`?
+
+-   `owlen` is the general-purpose chat client.
+-   `owlen-code` is an experimental client with a system prompt that is optimized for programming and code-related questions. In the future, it will include more code-specific features like file context and syntax highlighting.
+
+### How do I use Owlen with a different terminal?
+
+Owlen is designed to work with most modern terminals that support 256 colors and Unicode. If you experience rendering issues, you might try:
+
+-   **WezTerm**: Excellent cross-platform, GPU-accelerated terminal.
+-   **Alacritty**: Another fast, GPU-accelerated terminal.
+-   **Kitty**: A feature-rich terminal emulator.
+
+If issues persist, please open an issue and let us know what terminal you are using.
+
+### What is the setup for Windows?
+
+The Windows build is currently experimental. However, you can install it from source using `cargo` if you have the Rust toolchain installed.
+
+1.  Install Rust from [rustup.rs](https://rustup.rs).
+2.  Install Git for Windows.
+3.  Clone the repository: `git clone https://github.com/Owlibou/owlen.git`
+4.  Install: `cd owlen && cargo install --path crates/owlen-cli`
+
+Official binary releases for Windows are planned for the future.
+
+### What is the setup for macOS?
+
+Similar to Windows, the recommended installation method for macOS is to build from source using `cargo`.
+
+1.  Install the Xcode command-line tools: `xcode-select --install`
+2.  Install Rust from [rustup.rs](https://rustup.rs).
+3.  Clone the repository: `git clone https://github.com/Owlibou/owlen.git`
+4.  Install: `cd owlen && cargo install --path crates/owlen-cli`
+
+Official binary releases for macOS are planned.
+
+### I'm getting connection failures to Ollama.
+
+Please see the [Troubleshooting Guide](troubleshooting.md#connection-failures-to-ollama) for help with this common issue.