docs: add homepage

Author: deandreamatias

pubspec.yaml

@@ -3,6 +3,7 @@ description: This package helps in creation of forms in Flutter by removing the
 version: 7.8.0
 repository: https://github.com/flutter-form-builder-ecosystem/flutter_form_builder
 issue_tracker: https://github.com/flutter-form-builder-ecosystem/flutter_form_builder/issues
+homepage: https://github.com/flutter-form-builder-ecosystem
 funding: 
   - https://opencollective.com/flutter-form-builder-ecosystem