update to Vx.x.23

Author: bigtreetech

Copy to SD Card root directory to update/README.md

@@ -10,12 +10,19 @@ The structure of the files in SD Card should be as follows
   - fonts: this is a bitmap fonts of ASCII and GBK. The font is Song typeface (don't need update every time)
 
 # software version
-### Vx.x.20
-- The first version of the Integration Project
-### Vx.x.21
-- fix unable to print properly from U disk(Stop printing at random)
-- fix busy popup with "Processing" in Printing and Stop Printing
+### Vx.x.23
+- add support TFT35 V3.0 (STM32F207)
+- add filament runout on/off button
+- replace Power off button with Rotate UI button
+- improve the compatibility of smoothieware
+- add manually leveling menu
+- add multi-serial port function (Touch screen can be directly controlled by ESP3D)
 ### Vx.x.22
 - clean up framework
 - add support TFT35 V2.0 (SDIO)
 - add function filament runout detect, power supply control
+### Vx.x.21
+- fix unable to print properly from U disk(Stop printing at random)
+- fix busy popup with "Processing" in Printing and Stop Printing
+### Vx.x.20
+- The first version of the Integration Project