Add base model metadata

This will expose a model tree for this model similar to the example below and help with the discovery of model fine-tunes and quants.


README.md

@@ -2,8 +2,11 @@
 library_name: transformers
 license: other
 license_name: nvidia-open-model-license
-license_link: https://developer.download.nvidia.com/licenses/nvidia-open-model-license-agreement-june-2024.pdf
+license_link: >-
+  https://developer.download.nvidia.com/licenses/nvidia-open-model-license-agreement-june-2024.pdf
 pipeline_tag: text-generation
+base_model:
+- nvidia/Hymba-1.5B-Base
 ---
 
 # Hymba-1.5B-Instruct