Add fastlane metadata (#152)

fastlane/metadata/android/en-US/full_description.txt

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+OwnDroid is a DPC (device policy controller) app.
+
+It supports the following working modes:
+
+- Device owner
+- Profile owner (only in secondary users)
+- Work profile
+- Dhizuku
+
+It has the following features:
+
+- System: disable camera, disable screenshot, master volume mute, disable USB signal, lock task mode, wipe data...
+- Network: add/modify/delete Wi-Fi, network stats, network logging...
+- Applications: suspend/hide app, block app uninstallation, grant/revoke permissions, clear app storage, install/uninstall app...
+- User restriction: disable SMS, disable outgoing call, disable bluetooth, disable NFC, disable USB file transfer, disable app installing/uninstalling...
+- Users: user information, create/start/switch/stop/delete user...
+- Password and keyguard: reset password, set screen timeout...

fastlane/metadata/android/en-US/short_description.txt

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+Use device owner privileges to manage your device

fastlane/metadata/android/zh/full_description.txt

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+OwnDroid是一个设备策略管理器app。
+
+它支持以下几种工作模式：
+
+- Device owner
+- Profile owner （仅在次要用户中）
+- 工作资料
+- Dhizuku
+
+它有以下功能：
+
+- 系统：禁用摄像头、禁止截屏、全局静音、禁用USB信号、锁定任务模式、清除数据...
+- 网络：添加/修改/删除 Wi-Fi、网络统计、网络日志...
+- 应用：挂起/隐藏应用、阻止应用卸载、授予/撤销权限、清除应用存储、安装/卸载应用...
+- 用户限制：禁止发送短信、禁止拨出电话、禁用蓝牙、禁用NFC、禁用USB文件传输、禁止安装/卸载应用...
+- 用户：用户信息、创建/启动/切换/停止/删除用户...
+- 密码与锁屏：重置密码、设置屏幕超时...

fastlane/metadata/android/zh/short_description.txt

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+使用device owner特权管理你的设备