Create a user-story.md file

[Amulya-coder]

Is your feature request related to a problem? Please describe.

Currently Issue template has only bug template and feature template but there is one more user story template which helps contributors to create the development plans and work tasks issues.

Describe the solution you'd like

Add user story template and write the documentation.

Additional context

For more details read this

[Amulya-coder]

@Abhishek-kumar09 I would like to work on this.