Add more precise license metadata (UI will be cleaner!)

Part of hacktoberfest_challenge -> [Hugging Face hub-docs] (https://github.com/huggingface/hub-docs/blob/main/hacktoberfest_challenges/model_license_other.md)

README.md

@@ -3,6 +3,8 @@ inference: false
 language:
 - en
 license: other
+license_name: llama-2-community-license
+license_link: https://huggingface.co/TheBloke/Llama-2-70B-fp16/blob/main/LICENSE.txt
 model_type: llama
 pipeline_tag: text-generation
 tags: