doc: update composer readme for build and validate command

[Prathiksha-Nataraja]

Pull Request Template

Description

Update composer readme.

Please select the options that are relevant.

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

Checklist:

• Pull Request follow only a single responsibility.
• Code follows the style guidelines of this project
• Performed a self-review of my own code
• Commented my code, particularly in hard-to-understand areas
• Made corresponding changes to the documentation
• Changes generate no new warnings
• Added tests that prove fix is effective or the feature works
• New and existing unit tests pass locally with the changes
• Any dependent changes have been merged and published in downstream modules
• Checked the code and corrected any misspellings

[shanithkk]

update in cli discription also

[shanithkk]

remove clap crate also

[shanithkk]

update screenshot

[shanithkk]

updated screenshot