Added CONTRIBUTING.md

Author: ribejara-te

CONTRIBUTING.md

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+# Contributing to Stacks
+
+Thank you for your interest in contributing to Stacks, the Terraform code pre-processor!
+Your contributions help us improve and enhance the project for everyone.
+
+## How to Contribute
+
+All kinds of contributions are welcome!
+Whether you're interested in coding, documentation, bug reports, or feature requests, your input is valuable.
+
+Please be respectful, inclusive, and considerate towards other contributors. Harassment or offensive behavior is not tolerated.
+
+## Getting Started
+
+To contribute to Stacks, follow these general steps:
+
+1. Fork the repository.
+2. Make your changes in your forked repository.
+3. Submit a pull request (PR) with your changes.
+4. Our team will review your PR and provide feedback. Please be patient during the review process.
+
+## Coding Guidelines
+
+We don't have strict coding style rules, but please aim to keep your code consistent with the existing style in the repository.
+
+## Licensing
+
+By contributing to Stacks, you agree that your contributions will be licensed under the [Apache License 2.0](LICENSE).
+
+## Contact
+
+If you have any questions, concerns, or suggestions, feel free to open an issue on the [GitHub Issues](https://github.com/cisco-open/Stacks/issues) tab.
+
+
+Thank you for contributing to Stacks! Your efforts help us build a better tool for the Terraform community.