Implement AnimatedContainer Widget to the Widget Catalog

[AryanKhubchandani]

AnimatedContainer Widget needs to be added to the Widget Catalog. Read How to contribute to the Widget Catalog in the README for detailed steps. Make sure to include all the arguments(name, implementation, description, codeString, link and category). Refer to any widget in widgetList.dart and its own *widget*.dart file for better understanding. Make the animation attractive by using different properties and not just one property. (Refer to the official docs in case of any doubts) Please attach screen recording of the same once done in the PR.

[curiousTejas]

Hey @AryanKhubchandani, I'd like to take up this issue!

[AryanKhubchandani]

Sure, good luck!