Update README.md

Add description and examples of usage

README.md

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+ # NorIdiom 
+
+This dataset was created for the Mímir project, as described in "The Impact of Copyrighted Material on Large Language Models: A Norwegian Perspective" [link to preprint](https://arxiv.org/abs/2412.09460)  
+The idioms in this dataset are manually curated, and some idioms may be less frequent/representative of Norwegian language than others.  
+For a frequency curated Norwegian idiom dataset, see [Sprakbanken/Norwegian_idioms](https://huggingface.co/datasets/Sprakbanken/Norwegian_idioms).
+
+This dataset contains 803 Norwegian idioms, 401 of which are Norwegian nynorsk and 402 that are Norwegian bokmål.
+
+## Usage
+This dataset can be used to evaluate a language model's abilty to complete Norwegian idioms.  
+The `idiom` feature contains the n-1 first words of an idiom, and the `completion` feature is the last word that completes the idiom in each row.  
+
+Load the Norwegian bokmål idioms like this:
+```python
+from datasets import load_dataset
+
+ds = load_dataset("mimir-project/noridiom", split="test", name="nb")
+```
+and the Norwegian nynorsk idioms like this:
+```python
+from datasets import load_dataset
+
+ds = load_dataset("mimir-project/noridiom", split="test", name="nn")
+```
+
+
+