Add Torch Geopooling Library

This patch adds a link to the Torch Geopooling extension for PyTorch -
collection of geospatial module for learning of 2d point clouds.

README.md

@@ -393,6 +393,7 @@ This is a curated list of tutorials, projects, libraries, videos, papers, books
 - [Pathfinder Discovery Networks for Neural Message Passing](https://github.com/benedekrozemberczki/PDN)
 - [SSSNET: Semi-Supervised Signed Network Clustering](https://github.com/SherylHYX/SSSNET_Signed_Clustering)
 - [MagNet: A Neural Network for Directed Graphs](https://github.com/matthew-hirn/magnet)
+- [PyTorch Geopooling: Geospatial Pooling Modules for Neural Networks in PyTorch](https://github.com/ybubnov/torch_geopooling)
 
 ## <a name='Sorting'></a>Sorting
 - [Stochastic Optimization of Sorting Networks via Continuous Relaxations](https://github.com/ermongroup/neuralsort)