Add README greek language

[adacapo21]

Is your feature request related to a problem? Please describe.
Currently, the README file is not available in Greek, which limits accessibility for Greek-speaking users.

Describe the solution you'd like
Add a Greek translation of the README file (README_GR.md) to the repository and update the main README file to include a link to the Greek version.

Describe alternatives you've considered
Alternative solutions include using external tools for translation, but a native README translation within the repository would better serve Greek-speaking contributors and users.

Additional context
This feature will improve inclusivity and broaden the reach of the Eliza framework for non-English speaking users, specifically those in the Greek-speaking community.

[github-actions]

Hello @adacapo21! Welcome to the ai16z community. Thank you for opening your first issue; we appreciate your contribution. You are now a ai16z contributor!

[tcm390]

implemented in #2199