Add logo for rspotify.

[ramsayleung]

Description

Add logo for RSpotify library

Motivation and Context

323

Dependencies

None

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

How has this been tested?

Yes

Is this change properly documented?

It's unnecessary.

Please make sure you've properly documented the changes you're making.

Don't forget to add an entry to the CHANGELOG if necessary (new features, breaking changes, relevant internal improvements).