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README.md

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-license: mit
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+license: mit
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+This is a Multi-Exposure Gradient dataset for low light enhancement and also for overexposure recovery, which contains about 1000 group of photos. 
+The contents include variety of scenes such as indoor, outdoor, sunny, rainy, cloudy, nightime, city, rural, campus and so on.
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+There are 5 photos in each group with different exposure gradient, from low light to overexposure noted as 01 to 05.
+We provide two versions, one is continuous shooting data, whose contents of each group maybe a little bit different because of the moving scene, but they have more natural illumination and color.
+The other is post processing data, whose contents of each group are strictly same, and the exposure is adjuste by PS.
+You can choose one version according to your requirement, for example the continuous shooting data for unsupervised learning and the post processing data for supervised learning.