Appends semi-colons (or whatever you want!) at the end of the current line.
Its default key bindings are
ctrl+;: Append a semi-colon at the end of the line.
Changing the appended character
In order to change the appended character, you can set the "colonizer.value" user or workspace setting.
Changing the key bindings
You can change the default key bindings by redefining the "extension.colonize" and "extension.colonizeAndBreakLine" commands.
Enjoy it, and contributions are welcome!