Update README.md

Author: VPKSoft

README.md

@@ -6,3 +6,12 @@ Keeps a dictionary with user-specified entries for searching, editing and saving
 The sreenshots of the app using the [sample data](https://github.com/VPKSoftOrg/json-dictionary-browser/blob/develop/sample_data/chat_abbreviations.json) containing chat abbreviations dictionary:
 ![image](https://github.com/user-attachments/assets/d284e847-58e3-4315-8561-c5bfacb1ef1f) ![image](https://github.com/user-attachments/assets/3013cbd4-40b2-4ecd-ae68-6133c26b4861)
 
+## The data format
+A JSON data array with unique *id*, and *custom* fields
+
+```json
+[
+    { "id": 10 , "name": "^5", "description": "High-five" },
+    { "id": 11 , "name": "^URS", "description": "Up yours" },
+}
+```