chore: create readme file

README.md

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+# distilbert-base-multilingual-cased-vietnamese-topicifier
+
+## About
+
+Fine-tuning from `distilbert-base-multilingual-cased` with a tiny dataset about Vietnamese topics.
+
+## Usage
+
+Try entering a message to predict what topic is being discussed. For example:
+
+```
+# Photography
+Tôi ước mình sẽ trở thành một nhiếp ảnh gia
+
+# World War I 
+Bạn đã từng nghe về cuộc đại thế chiến ?
+```
+
+## Other
+
+The model was fine-tuning with a tiny dataset, don't use it for a product.