Add contributing

Author: clementbiron

CONTRIBUTING.md

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+# Contributing to this repository
+
+## Contributions to make
+
+You can add documents for tracking by submitting a pull request either using the GUI contributing tool, or by creating a JSON file. There are three kind of contributions you can make:
+
+- Adding declarations to a collection;
+- Updating declarations in a collection;
+- Removing declarations from a collection.
+
+## 🚀 How to Contribute
+
+- You can check the open issues in this repository, assign yourself and solve them. These issues are related to terms that need to be updated. Read more from our [documentation](https://docs.opentermsarchive.org/contributing-terms/#maintaining-declarations)
+- You can also add terms to this repository either by adding JSON files or using the contribution tool
+
+You can check the documentation for detailed information on [contributing terms](https://docs.opentermsarchive.org/contributing-terms/).
+
+## 📜 Read our Code of Conduct
+
+Before you begin coding and collaborating, please read our [Code of Conduct](./CODE_OF_CONDUCT.md) thoroughly to understand the standards (that you are required to adhere to) for community engagement. As part of our open-source community, we hold ourselves and other contributors to a high standard of communication. As a participant and contributor to this project, you are agreeing to abide by our Code of Conduct.
+
+## 💻 Need Help?
+
+We are more than happy to help you. If you are facing problems while working on any issue, don’t hesitate to ask for help.
+
+Your contribution, no matter its size, holds immense value. We eagerly await to see the impact you'll make in our community! 🚀
+
+## List a new contributor in the Open Terms Archive website
+
+We acknowledge the efforts of our contributors by listing them on our [website](https://opentermsarchive.org) and this is made possible by the use of the [All Contributors bot](https://allcontributors.org/docs/en/bot/overview).
+
+All Contributors enables adding a contributor with a comment on an issue or pull request, without writing code. To do this, please use the [dedicated issue](https://github.com/OpenTermsArchive/dating-declarations/issues/212) on this repository.
+
+Please read the following [contributing guide](https://github.com/OpenTermsArchive/opentermsarchive.org/blob/main/CONTRIBUTING.md#list-a-new-contributor-in-the-open-terms-archive-website).