Add installable create-plan skills for codex, claude-code, and opencode

docs/install.md

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+# Installation
+
+Install from this repo similarly to superpowers: clone once, then copy/symlink agent-specific skills.
+
+## 1) Clone
+
+```bash
+git clone https://git.fiorinis.com/Home/ai-coding-skills.git
+cd ai-coding-skills
+```
+
+## 2) Install `create-plan`
+
+### Codex
+
+```bash
+mkdir -p ~/.codex/skills/create-plan
+cp -R skills/create-plan/codex/* ~/.codex/skills/create-plan/
+```
+
+### Claude Code
+
+```bash
+mkdir -p ~/.claude/skills/create-plan
+cp -R skills/create-plan/claude-code/* ~/.claude/skills/create-plan/
+```
+
+### OpenCode
+
+Use your OpenCode skills/plugin path and copy the opencode variant.
+
+```bash
+# Example path (adjust for your environment)
+mkdir -p ~/.opencode/skills/create-plan
+cp -R skills/create-plan/opencode/* ~/.opencode/skills/create-plan/
+```
+
+## 3) Verify
+
+- Ensure `SKILL.md` exists in the destination folder.
+- Ensure `templates/` files are present.
+- Start a new agent session and ask: "create a plan for ..." to verify trigger behavior.
+
+## Notes
+
+- `docs/plans` / `docs/plan` can be gitignored by design.
+- Plan artifacts are intentionally local.