Add pipeline tag

This PR adds the `time-series-forecasting` pipeline tag to the model card metadata. This ensures that the model is correctly categorized and discoverable for users interested in forecasting tasks on the Hugging Face Hub.

README.md

@@ -1,6 +1,7 @@
 ---
-license: cc-by-nc-4.0
 library_name: pytorch
+license: cc-by-nc-4.0
+pipeline_tag: time-series-forecasting
 tags:
 - weather
 - weather-forecasting
@@ -10,6 +11,7 @@ tags:
 - transformer
 - probabilistic-forecasting
 ---
+
 <p align="center">
   <img src="figures_weather/mosaic_header.jpg" alt="Mosaic" width="70%">
 </p>
@@ -247,4 +249,4 @@ If you use Mosaic, please cite:
   year      = {2026},
   url       = {https://arxiv.org/abs/2604.16429}
 }
-```
+```