add: CONTRIBUTING.md

Author: Essoz

CONTRIBUTING.md

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+# Contributing to TrainCheck
+
+Thank you for your interest in contributing to TrainCheck. This project is actively maintained, and we welcome contributions from the community.
+
+## 🧩 Areas for Contribution
+
+We encourage contributions in the following areas:
+
+- 🛠️ **Core Features**: Implementation of new invariant types, enhanced instrumentation, and improved fault localization.
+- ⚙️ **Framework Support**: Expanding compatibility with DeepSpeed, HuggingFace Trainer, and multi-GPU environments.
+- 📖 **Documentation**: Creating usage guides, walkthroughs, and clarifications (documentation is currently limited).
+- 🔍 **Testing**: Adding realistic traces and increasing coverage for components that are not thoroughly tested.
+- 🚧 **Engineering Improvements**: Enhancing log formatting, improving CLI usability, and performing code cleanup.
+
+**For specific tasks and upcoming features where we need assistance, please see our [ROADMAP (TBD)](./ROADMAP.md) for planned directions and priorities.**
+
+## ⚠️ Important Information for Contributors
+
+**TrainCheck** is structured as a standard Python library. Please follow conventional Python development practices.
+
+- **Code Style**: Install the pre-commit hooks in your development environment:
+    ```bash
+    pip install pre-commit
+    pre-commit install
+    pip install isort
+    ```
+- **Documentation**: The documentation is currently under development. If you have any questions or require clarification, please join our Discord server via the [README](./README.md).
+- **Testing**: The test structure is being finalized (see TEST.md (TBD)). In the interim, you are welcome to add unit or end-to-end tests in the `tests/` directory as appropriate.
+
+## 💬 Questions?
+
+Join our Discord server (see [README](./README.md)) — don’t hesitate to ping us there. We’d love to help you get started.
+
+