docs: add Qoder skill installation guidance

Author: phodal

README.md

@@ -121,6 +121,7 @@ The `skills/*/SKILL.md` files follow the universal skill format and work with an
 | **OpenCode** | Copy skill folders to `.opencode/skills/` | Skills only |
 | **Cursor** | Copy skill folders to `.cursor/skills/` | Skills only |
 | **Kiro** | Copy skill folders to `.kiro/skills/` | Skills only |
+| **Qoder** | Copy skill folders to `.qoder/skills/` | Skills only |
 
 ```bash
 # Example: copy all skills for OpenCode (project-level)