Add skills library and plugin configs for Claude, Cursor, Codex, and OpenCode

- Add frontend-dev, fullstack-dev, and android-native-dev skills
- Add plugin configs for Claude Code, Cursor, Codex, and OpenCode
- Add English and Chinese READMEs with installation instructions
- Add .gitignore

.cursor-plugin/plugin.json

@@ -0,0 +1,14 @@
+{
+  "name": "minimax-skills",
+  "displayName": "MiniMax Skills",
+  "description": "MiniMax AI skills library: frontend development, fullstack development, and Android native development",
+  "version": "1.0.0",
+  "author": {
+    "name": "MiniMax AI"
+  },
+  "homepage": "https://github.com/MiniMax-AI/skills",
+  "repository": "https://github.com/MiniMax-AI/skills",
+  "license": "MIT",
+  "keywords": ["skills", "frontend", "fullstack", "android", "minimax"],
+  "skills": "./skills/"
+}