Add screen-refresh-rate-changer extension

[MoroccoBS]

Description

Screencast

Checklist

• I read the extension guidelines
• I read the documentation about publishing
• I ran npm run build and tested this distribution build in Raycast
• I checked that files in the assets folder are used by the extension itself
• I checked that assets used by the README are placed outside of the metadata folder

[raycastbot]

Congratulations on your new Raycast extension! 🚀

Due to our current reduced availability, the initial review may take up to 10-15 business days.

Once the PR is approved and merged, the extension will be available on our Store.