Added description about vorp_billing script to README.MD

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Pull request template

Important

Please complete all fields. PRs will not be merged if any fields are incomplete. Be respectful, and keep in mind that it may take some time for your PR to be reviewed.

Bear in mind refactors are up to the developers and not it's contributors after all we are the ones giving support when needed. if they are big changes I suggest you to release it under your name instead.

Type of change

• 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

Motive for This Pull Request

Added description about vorp_billing script to README.MD

Provide a brief explanation of why these changes are being proposed and what they aim to achieve.

Added description about vorp_billing script to README.MD

Explain the necessity of these changes and how they will impact the framework or its users.

Added description about vorp_billing script to README.MD

Please describe the tests you have conducted to verify your changes. Provide instructions so we can reproduce these tests. Also, list any relevant details for your test configuration.

• Tested with latest vorp scripts
• Tested with latest artifacts

Notes if any

Added description about vorp_billing script to README.MD