Add readme

README.md

@@ -30,4 +30,58 @@ configs:
   data_files:
   - split: train
     path: data/train-*
+task_categories:
+- visual-question-answering
+language:
+- de
+tags:
+- Känguruh-Wettberwerb
+- math
+- vlm
+- school
 ---
+
+# Känguruh Wettbewerb Dataset
+
+This dataset is a German benchmark from the official _Känguru der Mathematik_ competition materials covering 1998--2025 [(Link)](https://www.mathe-kaenguru.de).
+Each instance is a single multiple-choice problem with five options (A - E) from school grade levels 3 - 13. The benchmark targets curriculum-aligned mathematical reasoning in German with explicit visual grounding (diagrams, geometric figures, spatial arrangements) while enabling controlled analyzes by year, grade group, difficulty, math subdomain, and modality.
+
+### Processing
+
+Collected PDFs are converted into benchmark-instances via the following four-step pipeline:
+
+* 1. Task localization and cropping
+* 2. Manual screening
+* 3. Solution alignment
+* 4. Structured fields and derived labels
+
+
+### Schema and Labels
+
+Each instance contains:
+* _image_: PNG crop
+* _answer_: ground-truth option
+* _year_: task year
+* _grade_level_: targetet school year of task
+* _task_id_: task id
+* _difficulty_: diffulty classes A, B, C
+* _math_category_: one of arithmetic, geometry, algebra, probability, unknown
+* _is_text_only_: bool
+
+
+## Dataset Overview
+
+| Statistic                      | Value               |
+| ---                            | ---                 |
+| Years                          | 1998 - 2025         |
+| Grade levels                   | 3 - 13 (grouped)    |
+| Source PDFs / pages            | 140 / 560           |
+| Answer format                  | 5-way MC (A - E)    |
+| Total tasks N                  | 3,557               |
+| Text-only / visually necessary | 61% / 39%           |
+| Difficulty (A/B/C)             | 32.9 / 33.3 / 33.8% |
+
+
+## Cite as
+
+[added later]