Implement SafeArea Widget to the Widget Catalog

[AryanKhubchandani]

SafeArea 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. Showcase examples with and without using this widget. (Refer to the official docs in case of any doubts)
Please attach screenshots of the same once done in the PR.

[ShravanSeth]

I would love to contribute in this

[AryanKhubchandani]

Cool, I will assign this to you.

[therealashugarg]

Hey, Can you assign this task to me?