chore: initialize gregWiki standalone repository

SPONSORS.md

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+# Sponsors
+
+Thank you for supporting the GregFramework ecosystem.
+
+## Top Sponsor (VIP)
+
+- **💎 The Ecosystem Architect ($50/month):** [@tobiasreichel](https://github.com/tobiasreichel)
+
+Premium benefits currently assigned:
+
+- Top sponsor placement on ecosystem-facing surfaces (Wiki front page + Mod Store footer)
+- Private 1-on-1 Discord lounge
+- Featured mod spotlight option
+
+## Sponsorship Tiers
+
+### ☕ $1 / month – The Coffee Supporter
+
+- GitHub sponsor badge
+- Discord `Supporter` role
+- Eternal gratitude
+
+### 🥉 $5 / month – Bronze Backer (Active Player)
+
+Includes all previous perks, plus:
+
+- Credits entry in GregTools Mod Manager (`Special Thanks / Sponsors`)
+- Access to sponsor-only Discord chat for spoilers/WIP/dev updates
+
+### 🥈 $15 / month – Silver Tester (Early Access)
+
+Includes all previous perks, plus:
+
+- Early access to pre-release and beta builds
+- Roadmap voting access for Silver+ backers
+
+### 🥇 $25 / month – Gold Developer (Pro Modder)
+
+Includes all previous perks, plus:
+
+- Priority handling for framework bug reports
+- Official Gold sponsor mention in repository `README.md`
+
+### 💎 $50 / month – The Ecosystem Architect (Premium/VIP)
+
+Includes all previous perks, plus:
+
+- Top sponsor placement on Wiki front page and Mod Store footer
+- Private 1-on-1 Discord lounge
+- Featured mod spot on `datacentermods.com`
+
+## Automation
+
+Use a repository workflow file at `.github/workflows/sponsor-tier-sync.yml` to export current sponsor tiers and drive Discord/website sync jobs.