Add generation_config.json for default generation settings

generation_config.json

@@ -0,0 +1,9 @@
+{
+  "do_sample": true,
+  "temperature": 0.8,
+  "top_k": 50,
+  "top_p": 0.95,
+  "max_new_tokens": 200,
+  "eos_token_id": 50256,
+  "transformers_version": "4.46.0"
+}