Update README with MetNet-3 and MetNet Global details

Added information about MetNet-3 and MetNet Global.

Author: jacobbieker

README.md

@@ -1,4 +1,4 @@
-# MetNet and MetNet-2
+# MetNet Model Implementations
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@@ -7,6 +7,10 @@ PyTorch Implementation of Google Research's MetNet for short term weather foreca
 
 MetNet-2 (https://arxiv.org/pdf/2111.07470.pdf) is a further extension of MetNet that takes in a larger context image to predict up to 12 hours ahead, and is also implemented in PyTorch here.
 
+MetNet-3 (https://arxiv.org/abs/2306.06079) extends it even further, incorporating more observations and data. There will be an implementation here eventually, but one isn't ready yet.
+
+MetNet Global (https://arxiv.org/abs/2510.13050) makes this a global precipitation forecasting model, and seems to be more similar to MetNet-2's architecture.
+
 ## Installation
 
 Clone the repository, then run