add llava and instructblip

Former-commit-id: 142fb6f4541a1acfefe66ff2574dabde53b00c06

data/mllm_example_dataset/README.md

@@ -0,0 +1,25 @@
+---
+dataset_info:
+  features:
+  - name: messages
+    list:
+    - name: content
+      list:
+      - name: index
+        dtype: int64
+      - name: text
+        dtype: string
+      - name: type
+        dtype: string
+    - name: role
+      dtype: string
+  - name: images
+    sequence: image
+configs:
+- config_name: default
+  data_files:
+  - split: train
+    path: data/train-*
+  - split: test
+    path: data/test-*
+---