Add description in README

README.md

@@ -9,4 +9,8 @@ app_file: app.py
 pinned: false
 ---
 
-Check out the configuration reference at https://huggingface.co/docs/hub/spaces-config-reference
+# LLMzSzŁ benchmark
+
+LLMzSzŁ (_LLM-y za Szkolną Ławą_, LLMs Behind the School Desk) is a comprehensive LLM benchmark for Polish,
+based on a collection of Polish national exams, including both academic
+and professional tests extracted from the archives of the [Polish Central Examination Board](https://cke.gov.pl).