📝 added contributing md

CONTRIBUTING.md

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+# Contributing to CachyOS Welcome
+
+## Prerequisites
+
+- Rust (stable, via `rustup`)
+- GTK 3.24.33+
+- `glib-2.0` and `gio-2.0` 2.66+
+
+Install all dependencies on CachyOS/Arch:
+
+```sh
+sudo pacman -S --needed rustup gtk3 glib2
+rustup toolchain install stable
+```
+
+## Building
+
+```sh
+cargo build
+```
+
+For a release build:
+
+```sh
+cargo build --release
+```
+
+## Code Style
+
+The project uses `rustfmt`. Before submitting, run:
+
+```sh
+cargo fmt
+```
+
+Configuration is in [rustfmt.toml](rustfmt.toml).
+
+## Translations
+
+Translations use [Fluent](https://projectfluent.org/) and live in [i18n/](i18n/). Each locale has its own directory (e.g., `i18n/de/`).
+
+To add a new language:
+
+1. Copy `i18n/en/` to `i18n/<locale>/`
+2. Translate the `.ftl` files
+3. Add the locale to [i18n.toml](i18n.toml)
+
+## Submitting Changes
+
+1. Fork the repository and create a feature branch
+2. Make your changes and ensure the build passes
+3. Run `cargo fmt` and `cargo clippy`
+4. Open a pull request with a clear description of the change
+
+## Debugging
+
+Run with verbose output using the `RUST_LOG` environment variable:
+
+```sh
+RUST_LOG=debug cargo run
+```
+
+Logs are written to both stdout and `~/.config/cachyos/cachyos-hello/cachyos-hello.log`.
+
+To filter log output to a specific module:
+
+```sh
+RUST_LOG=cachyos_hello=debug cargo run
+```
+
+To suppress noisy crates:
+
+```sh
+RUST_LOG=debug,i2n_embed=warn,which=warn cargo run
+```
+
+## Reporting Issues
+
+Use the [GitHub issue tracker](https://github.com/cachyos/cachyos-welcome/issues). Include your CachyOS version and steps to reproduce.