update readme

README.md

@@ -11,6 +11,8 @@ Delete all your messages in public and private chats.
 
 ## Usage
 
+### GUI mode
+
 1. Download the release from the [Releases page][1];
 2. Unpack;
 3. Run.
@@ -25,6 +27,19 @@ those.
 To authenticate, you will use your Telegram Account phone number and the code,
 that will be sent to you in-app or a text message (SMS).
 
+### Batch/Script mode
+
+You can also run the deletion from script.  Follow these steps:
+
+1. Get the list of chat IDs that you want to wipe:
+   ```shell
+   wipemychat -list
+   ```
+2. Use the chat IDs with `-wipe` flag:
+   ```shell
+   wipemychat -wipe 12345,56789
+   ```
+
 ## Licence
 GNU Public Licence 3.0, see [LICENCE][2]