feat:添加sub2sing-box到列表

apps/sub2sing-box/README.md

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+# sub2sing-box
+
+## cli
+
+- convert: 转换
+- server: 启动 Web UI
+- version: 版本信息
+
+`sub2sing-box <command> -h` 查看帮助
+
+## api
+
+### GET /convert?data=xxx
+
+data 为 base64 URL 编码的请求体，示例
+
+```
+{
+  "subscriptions": ["订阅地址1", "订阅地址2"],
+  "proxies": ["代理1", "代理2"],
+  "template": "模板路径",
+  "delete": "",
+  "rename": {"原文本": "新文本"},
+  "group": false,
+  "group-type": "selector",
+  "sort": "name",
+  "sort-type": "asc"
+}
+```
+
+## Template 占位符
+
+- `<all-proxy-tags>`: 插入所有节点标签
+  ```
+  {
+    "type": "selector",
+    "tag": "节点选择",
+    "outbounds": ["<all-proxy-tags>",   "direct"],
+    "interrupt_exist_connections": true
+  }
+  ```
+- `<all-country-tags>`: 插入所有国家标签
+  ```
+  {
+    "type": "selector",
+    "tag": "节点选择",
+    "outbounds": ["<all-country-tags>", "direct"],
+    "interrupt_exist_connections": true
+  }
+  ```
+- `<国家(地区)二字码>`: 插入国家(地区)所有节点标签，例如 `<tw>`
+  ```
+  {
+    "type": "selector",
+    "tag": "巴哈姆特",
+    "outbounds": ["<tw>", "direct"],
+    "interrupt_exist_connections": true
+  }
+  ```
+
+## Docker
+
+`docker run -p 8080:8080 nite07/sub2sing-box`