Update README.md

README.md

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----
-license: mit
----
+---
+license: mit
+language:
+- ru
+tags:
+- ocr
+---
+
+## Basic Description
+
+Dataset contains source images and human-readable extracted texts. All texts were published in Russia in the 19th century and written using pre-reform orthography.
+
+The dataset is designed to train and evaluate optical character recognition systems for texts published in Russian before the orthographic reform (1917).
+
+## Data structure
+
+For each text there is a file with its image and the text corresponding to this image. The names of these files are the same except for the extension or suffix `_image` and `_text` respectively. The images are placed in either pdf or png files. The texts are contained in files with the extension txt. For example:
+
+* `afanasjev-chuzhbinskij_a_s.peterburgskie_igroki.pdf`
+* `afanasjev-chuzhbinskij_a_s.peterburgskie_igroki.txt`
+
+Or:
+
+* `300_page_image_009.png`
+* `300_page_text_009.txt`
+
+Long texts (mostly novels) are presented in `pdf`. They can be found in the `pdf` subfolder inside the `books-pdf-plaintext` folder. The neighboring `txt` subfolder contains their corresponding texts.
+Short texts of one-page length are in the `pages-img-plaintext` folder, where images are in `png` format.
+
+## The specifics of the old orthography
+
+Old orthography differs from modern orthography in that it contains 4 letters that were removed from the Russian alphabet after the reform, as well as a set of later abolished specific rules for spelling words.
+
+These letters and rules are taken into account in a special package for Python, which is designed to convert text from the old orthography to the new one: [prereform2modern](https://pypi.org/project/prereform2modern/).
+
+## Examples
+
+### Image
+
+![](./pages-img-plaintext/306_page_image_015.png)
+
+### Corresponding text
+
+7
+
+вамъ это происшествіе со всѣми должными приправами: съ непритворнымъ ужасомъ на лицѣ, въ глазахъ; съ содроганіемъ; съ восклицаніями и, наконецъ, съ поднятіемъ рукъ къ Небу!… Вы увидите какъ это послѣднее тѣлодвиженіе картинно въ немъ.»
+
+«Не слишкомъ ли много чести, отецъ ректоръ, для жидовскаго раввина, что вы удостоиваете смѣяться надъ нимъ?»
+
+«Кто вамъ сказалъ, что я смѣюсь надъ нимъ? вотъ увидите сами; пошлите завтра къ нему сказать, чтобъ пришелъ къ вамъ; онъ явится тотчасъ и тогда просто скажите ему, что вамъ любопытно знать для чего всѣ двѣнадцать деревень названы однимъ
+
+## Acknowledgements
+
+Dataset was formed thanks to the organizational help of Alexey V. Vdovin.