Upload dataset, README and LICENSE

LICENSE.txt

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+MIT License (for code)
+======================
+
+Copyright (c) 2025 Dang Do Cao
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+---
+
+CC BY 4.0 License (for dataset)
+===============================
+
+You are free to:
+- Share — copy and redistribute the material in any medium or format
+- Adapt — remix, transform, and build upon the material for any purpose, even commercially.
+
+Under the following terms:
+- Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made.
+
+License details: https://creativecommons.org/licenses/by/4.0/

README.md

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+---
+pretty_name: "Vietnamese Question Answering Dataset"
+license: cc-by-4.0
+language:
+  - vi
+task_categories:
+  - question-answering
+tags:
+  - vietnamese
+  - nlp
+  - dataset
+---
+
+# Vietnamese Question Answering Dataset
+
+## Mô tả
+Bộ dữ liệu này gồm các câu hỏi và câu trả lời tiếng Việt, được thiết kế cho các tác vụ **Question Answering** trong nghiên cứu và ứng dụng NLP.
+
+## Cấu trúc dữ liệu
+- **train.jsonl** (~80%)
+- **validation.jsonl** (~10%)
+- **test.jsonl** (~10%)
+
+Mỗi dòng là một đối tượng JSON:
+```json
+{"question": "Câu hỏi?", "answer": "Câu trả lời", "context": "Đoạn văn bản liên quan"}