Update README.md

README.md

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 [https://www.sciencedirect.com/science/article/abs/pii/S0306457319303413]
 
+"Our experimental results showed that all models did very well on SANAD corpus with a minimum accuracy of 93.43%, achieved by CGRU, and top performance of 95.81%, achieved by HANGRU."
 |         Model           |         Accuracy        | 
 | :---------------------: | :---------------------: | 
 |           CGRU          |          93.43%         |