docs: updated README.md for Bash and powershell

[iamayushdas]

Description

Please include a summary of the change and which issue is fixed. List any dependencies that are required for this change.

Fixes #810

Replace issue_no with the issue number which is fixed in this PR

Type of change

Please delete options that are not 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
• Documentation Update

Checklist:

• My code follows the style guidelines(Clean Code) of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have created a helpful and easy to understand README.md
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests/screenshots(if any) that prove my fix is effective or that my feature works