Add new Emoji key

Author: Andre601

contributors.md

@@ -24,6 +24,8 @@ Developes a library used by this project.
 Provides a site, service or similar that is used by the project (e.g. CI-Server).
 - 🚧 (Maintenance)  
 Helps maintaining this project, being it updating dependencies, or adding new features.
+- 📖 (Documentation)  
+Helped updating or improving the documentation of this project.
 
 # List of contributors
 Below can you find a list of all currently aknowledged Contributors to our project.