Update README.md

[jmaneyrol69]

Update link

Description

Please include a summary of the change and which issue is fixed if any. Please also include relevant motivation and context (a screenshot is appreciated).

Update README: change link to Login API.

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)
• [x] Documentation update

Checklist

• [ ] I've read & comply with the contributing guidelines
• [ ] I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• [x] I have made corresponding changes to the documentation (README.md).
• [ ] I've checked my modifications for any breaking changes.