Update README.md

add experimental survey paper.

README.md

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 BasicTS (**Basic** **T**ime **S**eries) is a PyTorch-based benchmark and toolbox for **time series forecasting** (TSF).
 
+🚩 ***Our experimental survey paper based on BasicTS is now available! Check it out on [arXiv](https://arxiv.org/pdf/2310.06119.pdf) to get more details and insights!***
+
 On the one hand, BasicTS utilizes a ***unified and standard pipeline*** to give a ***fair and exhaustive*** reproduction and comparison of popular deep learning-based models. 
 
 On the other hand, BasicTS provides users with ***easy-to-use and extensible interfaces*** to facilitate the quick design and evaluation of new models. At a minimum, users only need to define the model architecture.