docs: create AGENTS.md

AGENTS.md

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+# AGENTS.md
+
+## Project Overview
+
+Python client library for Crowdin API v2 and Crowdin Enterprise API v2.
+
+Main structure:
+- Source code: `crowdin_api/`
+- Tests: `crowdin_api/tests/` and `crowdin_api/api_resources/**/tests/`
+
+## Setup Commands
+
+- Install dependencies: `python -m pip install --upgrade pip && pip install -r requirements/requirements-dev.txt`
+- Run tests: `pytest`
+- Run one test file: `pytest crowdin_api/api_resources/.../tests/test_*.py`
+- Lint: `flake8 . --count --show-source --statistics`
+
+## Code And Testing Expectations
+
+- Add or update unit tests for behavior changes.
+- Keep public API and model changes backward compatible unless explicitly intended.
+- Follow existing style and lint configuration (`setup.cfg`, `flake8`).
+- Keep changes focused and consistent with existing resource patterns.
+
+## Notes For API Details
+
+Always use Crowdin/Crowdin Enterprise `llms.txt` index files for API method details. Choose the correct index by environment first, then project type.
+
+Use these URLs:
+
+- https://support.crowdin.com/_llms-txt/api/crowdin/file-based.txt - Crowdin API (file-based projects, preferred first)
+- https://support.crowdin.com/_llms-txt/api/crowdin/string-based.txt - Crowdin API (string-based projects)
+- https://support.crowdin.com/_llms-txt/api/enterprise/file-based.txt - Crowdin Enterprise API (file-based projects)
+- https://support.crowdin.com/_llms-txt/api/enterprise/string-based.txt - Crowdin Enterprise API (string-based projects)
+
+Each index contains links to method details (for example, `.../api.projects.strings.get.txt`).
+
+## Pull Requests And Commits
+
+- Use Conventional Commits for commit messages and PR titles.
+- Before opening a PR, run lint and tests locally.