feat: add top-level SKILL.md for ClaWHub publishing

SKILL.md

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+---
+name: openclaw-master-skills
+description: A curated collection of 127+ best OpenClaw skills from across the ecosystem — including AI tools, productivity, marketing, frontend, mobile, backend, database, auth, DevOps, and web automation skills. Sourced weekly from skills.sh, GitHub, and ClaWHub. Use when you want to install a comprehensive skill pack for your OpenClaw agent. Powered by MyClaw.ai.
+---
+
+# OpenClaw Master Skills
+
+A curated, weekly-updated collection of the best OpenClaw skills from across the ecosystem.
+
+## What's Included
+
+127+ skills across 11 categories:
+
+- **AI Tools** (18) — PDF, DOCX, XLSX, PPTX, MCP builder, canvas design, and more from Anthropic
+- **Productivity** (15) — Brainstorming, debugging, TDD, parallel agents, code review from obra/superpowers
+- **Marketing** (23) — SEO, copywriting, content strategy, CRO, paid ads from coreyhaines31
+- **Frontend** (29) — Vercel, Next.js, Vue, Vite, Tailwind, React Native, AI SDK
+- **Mobile** (13) — Expo skills for React Native development
+- **Backend** (9) — API design, Node.js, FastAPI, architecture patterns
+- **Database** (2) — PostgreSQL, Supabase
+- **Auth** (2) — better-auth best practices
+- **DevOps** (12) — Git, CI/CD, GitHub Copilot workflows
+- **Web Automation** (3) — Browser-use, Firecrawl, website auditing
+- **Other** (1) — React Doctor
+
+## How to Use
+
+Install individual skills:
+```bash
+clawhub install <skill-name>
+```
+
+Or clone the full collection:
+```bash
+git clone https://github.com/LeoYeAI/openclaw-master-skills.git
+cp -r openclaw-master-skills/skills/. ~/.openclaw/workspace/skills/
+```
+
+## Updates
+
+Updated every Monday. See [RELEASES.md](https://github.com/LeoYeAI/openclaw-master-skills/blob/main/RELEASES.md) for full release history.
+
+> Powered by [MyClaw.ai](https://myclaw.ai)