Update README.md

README.md

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-This is a dataset created by text-image pairs collected from greek Twitter.  
+This is a dataset for sentiment analysis created by text-image pairs collected from greek Twitter.  
 posted: from April 2023 to September 2023  
 Context: general purpose, mostly politics and athletics  
 Total pairs: 260  
-The purpose of the dataset is to be used as a test dataset, not for training/fine-tuning a model.  
+The purpose of the dataset is to be used as a test dataset, not for training/fine-tuning a model.  
+Labels: Negative, Neutral, Positive  
+labelling.xlsx contains the labels for texts,images and both modalities.