add minimal tests

README.md

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 ## Tesseract
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+[![<ORG_NAME>](https://circleci.com/gh/learning-at-home/tesseract.svg?style=svg)](https://circleci.com/gh/learning-at-home/tesseract)
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 Distributed training of large neural networks across volunteer computers.
 
 ![img](https://i.imgur.com/GPxolxb.gif)