[DOCS] added contribution (#84)

* doc: added contribution

Author: a-chumagin

CONTRIBUTING.md

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+# Contributing to Data-Quality-Gate
+
+Thank you for your interest in contributing to Data-Quality-Gate! This document outlines the process and guidelines for contributing to our project.
+
+## Code of Conduct
+
+By participating in this project, you agree to abide by our [Code of Conduct](https://github.com/provectus/data-quality-gate/blob/main/CODE_OF_CONDUCT.md). Please read it before contributing.
+
+## Reporting Issues
+
+- Search for existing issues before reporting a new one.
+- Provide a clear and concise description of the issue.
+- Include steps to reproduce the issue and any relevant error messages or logs.
+- If possible, provide a minimal, reproducible example.
+
+## Submitting Pull Requests
+
+- Fork the repository and create a new branch for your changes.
+- Ensure that your branch is up-to-date with the latest version of the main branch.
+- Follow the project's coding style and conventions.
+- Add a meaningful title and description for your pull request (PR)
+  - [BUGFIX] for PRs that address minor bugs without changing behavior.
+  - [FEATURE] for significant PRs that add a new feature likely to require being added to our feature maturity matrix.
+  - [MAINTENANCE] for PRs that focus on updating repository settings or related changes.
+  - [DOCS] for PRs that focus on updating or adding documentation.
+- Write clear and concise commit messages.
+- Include tests to ensure that your changes do not introduce regressions.
+- Provide a description of the changes you made in the pull request description.
+- Address any feedback or requested changes from the maintainers.
+
+## Testing
+
+- Write tests for your changes, ensuring that they cover edge cases and potential issues.
+- Use the provided testing framework or create a new one if necessary.
+- Ensure that your tests are comprehensive and cover both positive and negative scenarios.
+
+## Documentation
+
+- Update the README and other documentation to reflect changes in the project.
+- Ensure that the documentation is clear, concise, and accurate.
+- Include examples and usage instructions to help users understand how to use the project.
+
+
+## Contact Us
+
+- If you have any questions or need assistance, feel free to open an issue or reach out to the maintainers on GitHub.
+- We welcome any suggestions for improvements or new features.
+
+We look forward to working with you and improving Data-Quality-Gate together!