fix(samples): added secrets file and updated documentation

[sjha2048]

Summary

secrets.js didn't exist because it was added in gitignore, hence removed it from there and updated documentation for the same.

Closing issues

closes #516

Types of changes

• 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 change)

Checklist

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[ghost]

All CLA requirements met.

[nikithauc]

@sjha2048 Thank you for your contribution!