Added LottieAnims Assets Folder in pubspec

pubspec.yaml

@@ -62,6 +62,7 @@ flutter:
   # To add assets to your application, add an assets section, like this:
   assets:
     - assets/
+    - assets/lottieanims/
   # An image asset can refer to one or more resolution-specific "variants", see
   # https://flutter.dev/assets-and-images/#resolution-aware.
   # For details regarding adding assets from package dependencies, see