Update STORAGE.md

[atharvtathe]

Description

Added a new site to random generators section

Context

Random letter generator website added.

Types of changes

• [ ] Bad / Deleted sites removal
• [ ] Grammar / Markdown fixes
• [x] Content addition (sites, projects, tools, etc.)
• [ ] New Wiki section

Checklist:

• [x] I have read the contribution guide.
• [x] I have made sure to search before making any changes.
• [x] My code follows the code style of this project.

[nbats]

ty but doesnt seem very useful, I'll put it here instead: https://rentry.org/aksry2vc