added readme

Author: Ekhao

tensorflow_datasets/image_classification/wake_vision/README.md

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-TODO(wake_vision): Markdown description of that will appear on the catalog page.
-Description is **formatted** as markdown.
+The Wake Vision dataset for person detection.
 
-It should also contain any processing which has been applied (if any),
-(e.g. corrupted example skipped, images cropped,...):
+The dataset contains images with annotations of whether each image contains a person. Additional annotations about perceived gender, perceived age, subject distance, lighting conditions, depictions, and specific body parts are also available.
+
+The dataset has been generated by relabelling Open Images v7. See the [Wake Vision Project Github Repository](https://github.com/Ekhao/Wake_Vision) for more information.
+
+We publish the annotations of this dataset under a CC BY 4.0 license. All images in the dataset are from the Open Images v7 dataset, which sourced images from Flickr listed as having a CC BY 2.0 license.