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CONTRIBUTING.md

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+# Contributing to NiriMod
+
+Thanks for your interest in contributing! NiriMod is a growing project and PRs are welcome.
+
+## Development setup
+
+System dependencies (Debian/Ubuntu names; adapt for your distro):
+
+```bash
+libcairo2-dev libgirepository-2.0-dev libgtk-4-dev libadwaita-1-dev
+```
+
+Then:
+
+```bash
+git clone https://github.com/srinivasr/nirimod.git
+cd nirimod
+uv sync
+uv run nirimod
+```
+
+Requires Python 3.12+ and a running Niri instance for full manual testing.
+
+## Before submitting a PR
+
+Run the same checks that CI runs:
+
+```bash
+uv run ruff check --fix .
+uv run ruff format .
+uv run mypy nirimod
+uv run pytest
+```
+
+All checks must pass before your PR can be merged.
+
+## Code style
+
+- Ruff enforces linting and formatting rules. Always run with `--fix` and `format`.
+- Mypy must pass clean. Don't use `assert` for type narrowing — restructure the code instead.
+- Follow existing patterns for option rows, pages, and GTK widgets rather than inventing new ones.
+
+## Scope
+
+- For larger changes, open an issue first so we can discuss the approach.
+- System settings that aren't managed by Niri (like Wi-Fi, Bluetooth, general theming outside of compositor scopes) are out of scope.
+
+## Reporting bugs
+
+Open a [GitHub issue](https://github.com/srinivasr/nirimod/issues) and include:
+
+- Niri version (`niri --version`)
+- Steps to reproduce
+- Relevant log output, if any