Create CONTRIBUTING.md

Author: graevka-lab

CONTRIBUTING.md

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+# CONTRIBUTING
+
+Thank you for your interest in contributing to the project!
+
+### Core Contribution Steps:
+1.  **Fork** the repository and create a branch: `feature/your-feature` or `fix/issue-number`.
+2.  **Verify** that your branch passes all tests and static analysis locally:
+    *   `black .`
+    *   `isort --profile black .`
+    *   `flake8`
+    *   `mypy`
+    *   `pytest`
+3.  **Describe** your changes in the PR: what was changed, why, and provide a brief usage example if applicable.
+4.  **Add tests** for any new features or regression fixes.
+5.  **Sign the CLA** (if required by the organization).
+
+### Code Standards:
+*   Follow **PEP8**.
+*   Use **type hints** wherever possible.
+*   Write compact commits with meaningful messages.
+
+### Review Process:
+*   PRs should generally contain **one logical task** or fix.
+*   For major changes, please **open an issue** first to discuss the design before implementation.