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* add AGENTS.md file

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AGENTS.md

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+<!-- 
+Think of AGENTS.md as a README for AI agents: a dedicated, predictable place to provide the context and instructions to help AI coding agents work on your project.
+See https://agents.md for more info
+-->
+
+# Repository Guidelines
+## Project Structure & Module Organization
+- Source: `nettacker/` (CLI: `nettacker/main.py`, API: `nettacker/api/`, core libs: `nettacker/core/`, modules: `nettacker/modules/`).
+- Entry points: `nettacker.py` (Python) and `poetry` script `nettacker`.
+- Tests: `tests/` (mirrors package layout: `tests/core/`, `tests/lib/`, etc.).
+- Docs & assets: `docs/`, `nettacker/web/static/`.
+- Runtime data (not for commit): `.nettacker/data/` (DB at `.nettacker/data/nettacker.db`, results in `.nettacker/data/results/`).
+
+## Build, Test, and Development Commands
+- Install: `poetry install` (uses `pyproject.toml`).
+- Lint/format (all hooks): `make pre-commit` or `pre-commit run --all-files`.
+- Tests: `make test` or `poetry run pytest` (coverage configured via `pyproject.toml`).
+- Run CLI: `poetry run nettacker --help` or `python nettacker.py --help`.
+- Docker (web UI): `docker-compose up`.
+
+## Coding Style & Naming Conventions
+- Python 3.9–3.12 supported. Use 4-space indents.
+- Line length: 99 chars (`ruff`, `ruff-format`, `isort` profile=black).
+- Names: modules/files `lower_snake_case`; functions/vars `lower_snake_case`; classes `PascalCase`; constants `UPPER_SNAKE_CASE`.
+- Keep functions small, typed where practical, and add docstrings for public APIs.
+
+## Testing Guidelines
+- Framework: `pytest` (+ `pytest-asyncio`, `xdist`).
+- Location/pattern: place tests under `tests/`; name files `test_*.py`; parametrize where useful.
+- Coverage: enforced via `--cov=nettacker` (see `tool.pytest.ini_options`). Add tests with new features and for bug fixes.
+- Run subsets: `poetry run pytest -k <expr>`.
+
+## Commit & Pull Request Guidelines
+- Commit messages: imperative tense, concise subject; reference issues (`Fixes #123`).
+- Before pushing: `pre-commit run --all-files` and `make test` must pass.
+- PRs: include a clear description, rationale, linked issue(s), test evidence (logs or screenshots for web UI), and update docs if behavior changes.
+
+## Security & Configuration Tips
+- Legal/ethics: only scan assets you are authorized to test.
+- Secrets: never commit API keys, DBs, or results; `.nettacker/data/` is runtime-only.
+- Config: defaults in `nettacker/config.py` (API key, DB path, paths). Review sensitive headers list before logging.