First Contribution

Hey, so I am doing my first contribution to PyTorch and have decided to take up this issue Generate special clear error messages for known common misuses in TorchScript as a way to better learn the codebase. Any recommendations to understanding the codebase to more efficiently work on this issue? It is within the nn.module within Torchscript.

cc @gmagogsfm as the person who marked that issue as looking for help.