Update README.md

README.md

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 license: apache-2.0
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+
+# Note
+Captcha images are presented as base64 string.
+All csv files have a "\t" separator.
+
+# Dataset consists of several files
+## fssp_*.csv
+
+I am publishing an updated version of the archive of 40,310 pictures, which I have divided into 4 categories:
+- 4 symbols on the picture - 6 747 pcs.
+- 5 symbols - 18 403 pcs.
+- 6 characters - 7,038 pcs.
+- 7 characters - 7 589 pcs.
+
+Symbols used in captcha
+'б','в','г','д','ж','к','л','м','н','п','р','с','т','2','4','5','6','7','8','9'
+
+
+# fms.csv
+
+About 15 thousand captcha imgs, which consists of 6 numbers.
+
+
+# rosreestr.csv
+
+About 10 thousand captcha, which consists of English characters and numbers with a length of 5 elements.
+
+# vk.csv
+
+About 19 thousand captcha, which consists of Russian characters and numbers from 5 to 6 elements long. Images from social network vk.com