Updated Create DevTerm CM4 OS image from scratch (markdown)

Create-DevTerm-CM4-OS-image-from-scratch.md

@@ -69,6 +69,42 @@ Delete wallpaper address `temple.jpg`,change the `desktop_bg` color to `#202020`
 change `/etc/hostname` to clockworkpi  
 in `/boot/cmdline.txt` ,add `fbcon=rotate:1`, remove `quiet` 
 
+**Screen rotation**
+change 
+```
+/etc/skel/.config/monitors.xml 
+/home/{pi,rpi-first-boot-wizard}/.config/monitors.xml 
+```
+to be like
+```
+<monitors version="2">
+  <configuration>
+    <logicalmonitor>
+      <x>0</x>
+      <y>0</y>
+      <primary>yes</primary>
+      <monitor>
+        <monitorspec>
+          <connector>DSI-1</connector>
+          <vendor>unknown</vendor>
+          <product>unknown</product>
+          <serial>unknown</serial>
+        </monitorspec>
+        <mode>
+          <width>480</width>
+          <height>1280</height>
+          <rate>60.000</rate>
+        </mode>
+      </monitor>
+      <transform>
+        <rotation>right</rotation>
+      </transform>
+    </logicalmonitor>
+  </configuration>
+</monitors>
+```
+
+
 ### Now quit the chroot env
 ```
 exit