Create Readme for every directive

[akshay-js]

1. Create the Readme file for every root directive
2. Add all demo in the Readme for better readability

[ShivaniThevar]

Hello @akshay-s-770,

I would like to address this issue.

I am new to open source contribution, so would you please tell me: how do I add the demo in the README.md...?

Regards