add GPG

Author: e2517

README.md

@@ -56,7 +56,7 @@ flutter clean
 ```
 
 ```
-  flutter build web --release
+flutter build web --release
 ```
 
 ## GitHub Actions
@@ -81,6 +81,12 @@ firebase deploy
 
 ## e2517
 
+To sign with GPG
+
+```
+git commit -S -m "your message"
+```
+
 [logo]: https://github.com/E2517/images/blob/main/images/flutter-web/flutterwebsite.png
 [firebase]: https://github.com/E2517/images/blob/main/images/flutter-web/firebase.png
 [flutter-giff]: https://github.com/E2517/images/blob/main/images/flutter-web/flutterweb.gif