added phyics informed ML notebooks of Tom Beucler

Author: stewartchrisecmwf

tier_2/physic_informed/.gitkeep

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+Contribution to ECMWF's MOOC on "Machine Learning in Weather & Climate"
+
+This repository includes two Google Colab notebooks for the physics-guided machine learning module:   
+
+1. Physically-constrained post-processing of surface weather   
+2. Physically-informed parameterization of subgrid processes for climate modeling   
+
+Note: This repository uses the [ECMWF modified Apache 2.0 license](https://github.com/ecmwf-projects/mooc-machine-learning-weather-climate/blob/main/LICENSE).