Update README

Add a basic description in README, in line with other models

README.md

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-license: apache-2.0
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+Graphcore and Hugging Face are working together to make training of Transformer models on IPUs fast and easy. Learn more about how to take advantage of the power of Graphcore IPUs to train Transformers models at [hf.co/hardware/graphcore](https://huggingface.co/hardware/graphcore).
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+# Wav2Vec2 Base model IPU config
+
+This model contains just the `IPUConfig` files for running the Wav2Vec2 base model (e.g. [wav2vec2-base](https://huggingface.co/facebook/wav2vec2-base)) on Graphcore IPUs.
+
+**This model contains no model weights, only an IPUConfig.** 
+
+## Usage
+
+```
+from optimum.graphcore import IPUConfig
+ipu_config = IPUConfig.from_pretrained("Graphcore/wav2vec2-base-ipu")
+```