Add 260+ Claude Code skills from skills.sh

Complete collection of AI agent skills including:
- Frontend Development (Vue, React, Next.js, Three.js)
- Backend Development (NestJS, FastAPI, Node.js)
- Mobile Development (React Native, Expo)
- Testing (E2E, frontend, webapp)
- DevOps (GitHub Actions, CI/CD)
- Marketing (SEO, copywriting, analytics)
- Security (binary analysis, vulnerability scanning)
- And many more...

Synchronized from: https://skills.sh/

Co-Authored-By: Claude <noreply@anthropic.com>

planning-with-files/docs/codex.md

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+# Codex IDE Support
+
+## Overview
+
+planning-with-files works with Codex as a personal skill in `~/.codex/skills/`.
+
+## Installation
+
+See [.codex/INSTALL.md](../.codex/INSTALL.md) for detailed installation instructions.
+
+### Quick Install
+
+```bash
+mkdir -p ~/.codex/skills
+cd ~/.codex/skills
+git clone https://github.com/OthmanAdi/planning-with-files.git
+```
+
+## Usage with Superpowers
+
+If you have [obra/superpowers](https://github.com/obra/superpowers) installed:
+
+```bash
+~/.codex/superpowers/.codex/superpowers-codex use-skill planning-with-files
+```
+
+## Usage without Superpowers
+
+Add to your `~/.codex/AGENTS.md`:
+
+```markdown
+## Planning with Files
+
+<IMPORTANT>
+For complex tasks (3+ steps, research, projects):
+1. Read skill: `cat ~/.codex/skills/planning-with-files/planning-with-files/SKILL.md`
+2. Create task_plan.md, findings.md, progress.md in your project directory
+3. Follow 3-file pattern throughout the task
+</IMPORTANT>
+```
+
+## Verification
+
+```bash
+ls -la ~/.codex/skills/planning-with-files/planning-with-files/SKILL.md
+```
+
+## Learn More
+
+- [Installation Guide](installation.md)
+- [Quick Start](quickstart.md)
+- [Workflow Diagram](workflow.md)