Update README.md

README.md

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 This is a LLAVA-compatible brain tumor dataset in JSONL format with image-text pairs for multimodal training.
 
-- 💡 **Modality**: Image + Text (Conversations)
-- 📁 **Structure**:
+-  **Modality**: Image + Text (Conversations)
+-  **Structure**:
   - `train.jsonl`: JSONL file where each entry contains:
     - `"image"`: path to image file (e.g., `images/1.jpg`)
     - `"conversations"`: list of message-response pairs
   - `images/`: contains 20 MRI image files
-- ✅ Compatible with LLaVA-style training.
+-    Compatible with LLaVA-style training.
 
 Example:
 ```json