Add llm-gemini plugin installation instructions

Fix installation instructions in README

fix: username in path

chore: add logo

Refactor: Improve LLM prompt for commit message generation

Feat: improve backtick handling

Improve handling of lock files in git diff command

fix: don't close terminal

Feat: Improved git diff command

Feat: Implement magic_diff function

Improved commit message generation with instructions

feat: add support for installing model plugins in README

feat: add wlcopy

Update README.md

Update messaging in magic_diff.sh to indicate diff generation process