Update README

Author: slgobinath

README.md

@@ -14,7 +14,10 @@ sudo pip3 install pygments
 
 Open LibreOffice, go to `Tools` -> `Extension Manager...` and add the extension `codehighlighter.oxt`
 
-## Assign keyboard shortcut to selected languages
+You can download the extension either from the official LibreOffice extensions page or from [releases](https://github.com/slgobinath/libreoffice-code-highlighter/files/971882/codehighlighter.oxt.zip).
+If you have downloaded the `codehighlighter.oxt.zip` file from GitHub releases, extract it before adding to the LibreOffice.
+
+## Assign keyboard shortcut to selected languages (Optional)
 Open the LibreOffice Writer and goto Tools -> Customize -> Keyboard
 - Select the LibreOffice option button (Available on top left corner)
 - Select any desired shortcut
@@ -34,3 +37,6 @@ Open the LibreOffice Writer and goto Tools -> Customize -> Keyboard
 <p align="center">
 <img src="https://raw.githubusercontent.com/slgobinath/libreoffice-code-highlighter/master/screenshots/code-highlighter-menu.png" align="center" width="600">
 </p>
+
+## License
+ - GPL v3