Added readme

README.md

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+# CO2 - Datapacks
+
+<div align=center>
+
+### [✅ ToDoList](https://github.com/orgs/Creative-Olympics/projects/4) 
+
+</div>
+
+If you want to contribute, please fork the repository and create Pull Requests on the main branch.
+
+Each update of the master branch is automatically deployed to the minecraft serveur (`play.gunivers.net`).
+
+
+### Related projects
+
+- [Build](https://github.com/Creative-Olympics/CO2-Build)
+- [Resource Pack](https://github.com/Creative-Olympics/CO2-Ressource-Pack)