Add root config.json (checkpoint index) so downloads of this repo are counted

The Hub counts model downloads on requests for the root config.json. It lists the eight checkpoint repositories and holds no weights.

README.md

@@ -96,6 +96,7 @@ THUSI-Lab/GameScaling-<size>-<mixture>   one repository per checkpoint
 └── video_preprocessor_config.json
 
 THUSI-Lab/GameScaling
+├── config.json                 index of the eight checkpoint repositories (no weights)
 ├── prompts/
 │   ├── system_prompt_template.txt  standard prompt, 3 slots (§2)
 │   └── example_doom_battle1.txt    complete Doom prompt (§2)

config.json

@@ -0,0 +1,15 @@
+{
+  "name": "GameScaling",
+  "description": "Index of the GameScaling checkpoints. This repository holds the inference client, prompts and scripts; the weights live in the checkpoint repositories below.",
+  "collection": "https://huggingface.co/collections/THUSI-Lab/gamescaling-model-6acf7c0c6500ebee61a7f872",
+  "checkpoints": {
+    "GameScaling-0.8B-S1": "THUSI-Lab/GameScaling-0.8B-S1",
+    "GameScaling-0.8B-S3": "THUSI-Lab/GameScaling-0.8B-S3",
+    "GameScaling-2B-S1": "THUSI-Lab/GameScaling-2B-S1",
+    "GameScaling-2B-S3": "THUSI-Lab/GameScaling-2B-S3",
+    "GameScaling-9B-S1": "THUSI-Lab/GameScaling-9B-S1",
+    "GameScaling-9B-S3": "THUSI-Lab/GameScaling-9B-S3",
+    "GameScaling-27B-S1": "THUSI-Lab/GameScaling-27B-S1",
+    "GameScaling-27B-S3": "THUSI-Lab/GameScaling-27B-S3"
+  }
+}