Update README.md

README.md

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 license: cc-by-nc-nd-4.0
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+# Face Mask Detection
+Dataset includes 250 000 images, 4 types of mask worn on 28 000 unique faces. All images were collected using the Toloka.ai crowdsourcing service and validated by TrainingData.pro
+
+# File with the extension .csv
+includes the following information for each media file:
+
+- **WorkerId**: the identifier of the person who provided the media file,
+- **Country**: the country of origin of the person,
+- **Age**: the age of the person,
+- **Sex**: the gender of the person,
+- **Type**: the type of media file
+- **Link**: the URL to access the media file
+
+# Folder "img" with media files
+- containg all the photos
+ which correspond to the data in the .csv file
+
+**How it works**: *go to the first folder and you will make sure that it contains media files taken by a person whose parameters are specified in the first 4 lines of the .csv file.*
+
+In order to get access to more than 250,000 photos or to learn more about our data, please contact our sales team by submitting a request on our website https://trainingdata.pro/ or emaling us at sales@trainingdata.pro