pref: add fcl.md

misc/fcl.md

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+# FCL 安装整合包教程
+
+- 在群文件下载整合包后，点击 **`保存到手机`**
+
+  ![image-20250316132423661](./assets/fcl-1.png)
+
+- 随后QQ提示保存位置
+
+  ![image-20250316132532855](./assets/fcl-2.png)
+
+- 点击 **`下载资源` -> `整合包` -> `安装整合包`**
+
+![image-20250316132321161](./assets/fcl-3.png)
+
+- 点击 **`导入本地整合包`**
+
+![image-20250316132231913](./assets/fcl-4.png)
+
+- 选择下载的整合包
+
+  ![image-20250316132623987](./assets/fcl-5.png)
+
+- 点击 **`安装`**
+
+  ![image-20250316132655936](./assets/fcl-6.png)