Add BACKUPLOONGARCH64.EFI for Loongson backup and restore OS

Signed-off-by: sulikun <sulikun@loongson.com>

LoongsonBackupOS/BACKUPLOONGARCH64.EFI.md5sum

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+9b42568c13da80d4bf74a704a9c838dc BACKUPLOONGARCH64.EFI

LoongsonBackupOS/README.md

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+# BACKUPOS
+
+[简体中文](https://github.com/loongson/Firmware/blob/main/LoongsonBackupOS/README_CN.md)
+
+Loongson BACKUPOS operations show as follows:
+
+```
+1.Prepare two USB drives and other storage devices. Format one USB drive as Fat32 and 
+ use it as a boot disk. Create a new EFI file (file name is not case sensitive) and 
+ copy BACKUPLOONGARCH64.EFI into it. Use one USB drive in ext3/ext4 format as a backup 
+ device for the system, with a capacity greater than the required backup file size.
+2.Connect two USB drives to the host, power on, and press F4 on the progress bar to 
+ access the function. As shown in Figure.
+```
+The picture is as follows:
+![image](https://github.com/loongson/Firmware/blob/main/Image/BACKUP-F4.jpg)
+
+```
+3.After press F4 can show the function it mainly includes backup and restore.
+```
+The picture is as follows:
+![image](https://github.com/loongson/Firmware/blob/main/Image/BACKUP-show.jpg)
+
+```
+4.In backup function, select the drive letter where the system is located for 
+ the source storage device, and select the drive letter where the backup files 
+ are located for the target storage device. A backup directory name will be
+ automatically assigned, as shown in figure. After selection, click on Start Backup.
+```
+The picture is as follows:
+![image](https://github.com/loongson/Firmware/blob/main/Image/BACKUP-back.jpg)
+
+```
+5.In restore function, select the system disk for the device that needs to be restored, 
+ select the storage disk for storing the original data, and name a file for it, this tool 
+ can name a default file as shown in Figure 4. After selecting, choose to start restoring.
+```
+The picture is as follows:
+![image](https://github.com/loongson/Firmware/blob/main/Image/BACKUP-restore.jpg)

LoongsonBackupOS/README_CN.md

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+# 龙芯备份还原操作系统
+
+龙芯备份还原操作系统操作流程如下：
+
+```
+1.准备两个U盘等存储设备，将一个U盘格式化为Fat32，作为引导盘，新建EFI文件（文件名不区分大小写），放入文件
+ BACKUPLOONGARCH64.EFI，一个U盘为ext等文件格式，作为用于备份系统的设备，容量需要大于所需备份文件大小。
+2.将两个U盘接入主机中，开机，进度条界面按F4即可进入功能。如图所示。
+```
+![image](https://github.com/loongson/Firmware/blob/main/Image/BACKUP-F4.jpg)
+
+```
+3.进入后，可以看到如图界面。主要包含备份和还原两个功能。
+```
+![image](https://github.com/loongson/Firmware/blob/main/Image/BACKUP-show.jpg)
+
+```
+4.选择备份功能。源存储设备选择系统所在盘符，目标存储设备选择备份文件所在盘符。会自动分配一个备份目录名字，
+ 如图所示。选好后，点击开始备份。
+```
+![image](https://github.com/loongson/Firmware/blob/main/Image/BACKUP-back.jpg)
+
+```
+5.选择还原功能。需要还原的设备选择系统盘，存放原始数据设备选择备份时的存储盘，在还原数据中选择需要还原的文件，如图。选好后，选择开始还原。
+```
+![image](https://github.com/loongson/Firmware/blob/main/Image/BACKUP-restore.jpg)