Update README.md

README.md

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 This repository contains the model from [this notebook on image classification with MNIST dataset using LeNet architecture](https://gitee.com/mindspore/mindspore/blob/r1.2/model_zoo/official/cv/lenet/README.md#). 
 
+## LeNet Description
+Lenet-5 is one of the earliest pre-trained models proposed by Yann LeCun and others in the year 1998, in the research paper Gradient-Based Learning Applied to Document Recognition. They used this architecture for recognizing the handwritten and machine-printed characters.
+
+The main reason behind the popularity of this model was its simple and straightforward architecture. It is a multi-layer convolution neural network for image classification.
+
+![LeNet Architecture](./lenet_architecture.jpg)
+
+[source](https://www.analyticsvidhya.com/blog/2021/03/the-architecture-of-lenet-5/)