Update Readme

README.md

@@ -5,9 +5,17 @@ A joint community effort to create one central leaderboard for LLMs. Contributio
 
 Visit the interactive leaderboard at https://llm-leaderboard.streamlit.app/.
 
-## How to contribute
+![Screenshot of streamlit application](media/streamlit_screenshot.jpg)
 
-You can contribute by:
-- adding a new model as a new row
-- adding a new benchmark as a new column
+## How to Contribute
+
+We are always happy for contributions! You can contribute by the following:
+
+- table work:
+    - filling missing entries
+    - adding a new model as a new row in `leaderboard.csv`
+    - adding a new benchmark as a new column in `leaderboard.csv` and add the benchmark to `benchmarks.csv`
+- code work:
+    - improving the existing code
+    - requesting and implementing new features