Add more Bloc Examples

[amartya-dev]

Currently, the repo only contains two examples of using flutter with bloc pattern, it will be good to have more examples

[amartya-dev]

General ideas for adding more examples:

• Refer to https://bloclibrary.dev/#/ for more details on usage.
• It is not necessary to use the library although it will be better to do so.
• The examples should not be a blond replica of existing work from someone else.