[Docs]: Document Zero-Paywall Verification Criteria in Project Wiki

[divyanshujethi]

Documentation Area

Project Wiki (https://github.com/RitualDev-Lab/DevShelf/wiki)

Current State / What is Missing

New submitters occasionally ask whether "14-day free trials" or "freemium tools that require entering a credit card up front" are eligible. We need an unambiguous policy page in the Wiki.

Suggested Improvement or New Content

Create a new Wiki page: Zero-Paywall-Policy.md detailing:

1. Allowed: 100% free tiers, community editions, no-card required freemium, open-source self-hostable tools.
2. Disallowed: Mandatory credit card on signup, time-limited trial periods (e.g. 14 days), bait-and-switch plans with hidden charges.
3. Disclosure Requirements: Free tier quota limits must be explicitly specified (e.g., 10,000 req/day).

Can you submit a PR for this docs update?

Yes! I can write and submit the pull request.