update README

README.md

@@ -56,4 +56,8 @@ Ensure that all links in your report and slides are accessible
     - scikit-learn ```pip install scikit-learn```
     - openCV ```pip install opencv-python```
 
-3. Trainning dataset: [English Handwritten Characters](https://www.kaggle.com/datasets/dhruvildave/english-handwritten-characters-dataset)   Size: 13.7MB / 25.2MB(after unzip)
+3. Trainning dataset: 
+    1. [English Handwritten Characters](https://www.kaggle.com/datasets/dhruvildave/english-handwritten-characters-dataset)   Size: 13.7 MB / 25.2 MB(after unzip)
+    2. [Handwritten Digits and English Characters](https://www.kaggle.com/datasets/hrishabhtiwari/handwritten-digits-and-english-characters/) Size: 85 MB / 545.57 MB(after unzip)
+    
+        *only use dataset_final.csv