[CONFIG] new contributing guidelines

CONTRIBUTING.md

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+# Contributing to this project
+
+Welcome, and thank you for your interest in contributing!
+
+The goal of this document is to provide a high-level overview of
+how you can contribute and explain how we accept contribution.
+
+## Reporting issues
+
+Please use [the repository issue tracker](https://github.com/sir-gon/algorithm-exercises-ts/issues)
+to report any issues..
+
+## Providing feedback or suggestions
+
+Similarly to bug reports, we accept improvement suggestions and feedback via
+[the repository issue tracker](https://github.com/sir-gon/algorithm-exercises-ts/issues).
+
+## Contributing code changes
+
+We are thrilled that you are interested in contributing code changes!
+
+You can make your own fork an next, make your increment.
+You only need to meet the following requirements for new contributions:
+
+* Any new increment MUST have a related test
+with high (or preferred full) coverage.
+* Use Clean Code principles.
+
+Once we've confirmed that we're ready to accept your contribution,
+feel free to open a pull request and link it in the issue ticket.
+
+I will be happy to receive new contributions!
+
+## Code of Conduct
+
+Please make sure to read and follow the [Code of Conduct](./CODE_OF_CONDUCT.md).