Adding screenshots of new Inretio theme

[gytisrepecka]

Adding screenshots of new theme called Inretio.

Description

Adding dark and light color scheme screenshots of new theme Inretio.

Motivation and Context

This theme conveniently shows Python virtual environment details in prompt.

How Has This Been Tested?

Tested theme in both dark and light mode.

Screenshots (if appropriate):

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:

• My code follows the code style of this project.
• If my change requires a change to the documentation, I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• If I have added a new file, I also added it to clean_files.txt and formatted it using lint_clean_files.sh.
• I have added tests to cover my changes, and all the new and existing tests pass.