mod readme, add grub show cmdline.

README.md

@@ -63,6 +63,11 @@
     msgfmt lang/zh_CN.po -o lang/zh_CN.mo    # This process will be automatically processed during packaging.
     ```
 
+## 一些使用教程
+* 中文: https://www.bilibili.com/video/BV1jk4y1Y7B7  
+    ##### `(From: http://mi-d.cn)`
+
+
 ## 打赏一下
 * > ### 作者: Ing  QQ群: 21609194  QQ频道: 0pg8m22666
 * <img src="https://raw.githubusercontent.com/wjz304/wjz304/master/my/20220908134226.jpg" width="400">

files/board/arpl/p1/grub/grub.cfg

@@ -73,11 +73,14 @@ if [ -s /zImage-dsm -a -s /initrd-dsm ]; then
     set timeout="1"
     menuentry 'Boot DSM kernel directly' --id direct {
       set_gfxpayload
+      echo "cmdline:"
+      echo "${dsm_cmdline}"
       echo "Loading DSM kernel..."
       linux /zImage-dsm ${dsm_cmdline}
       echo "Loading DSM initramfs..."
       initrd /initrd-dsm
       echo "Booting..."
+      echo "Access http://find.synology.com/ to connect the DSM via web."
     }
   fi
   menuentry 'Boot DSM' --id boot {