added stop watch

[danshika42]

Description

React Stop watch
Fixes #(issue number)

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change)
• New feature (non-breaking change)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so that they can be reproduced.

• Test A
• Test B

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules