Update README.md

README.md

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 # Chat-Analyser-Live
 Whatsapp Chat Analyser Webapp
 
-Live App : [Website](https://chat-analyzer-live.herokuapp.com/)
+Live WebApp : [Website](https://chat-analyzer-live.herokuapp.com/)
+
+You need to first have the chat file in .txt format to be able to use the app.
+
+### How to export a WhatsApp chat? 
+
+[Source](https://faq.whatsapp.com/android/chats/how-to-save-your-chat-history/?lang=en)
+
+You can use the export chat feature to export a copy of the chat history from an individual or group chat.
+
+1. Open the individual or group chat
+2. Tap More options <img src="https://user-images.githubusercontent.com/53982388/169608769-9849dd3a-f2bd-4dd2-a8f8-7146acb42400.png" width="20" height="20">> More > Export chat.
+3. Now, select 'WITHOUT MEDIA'.