Updated usb serial console (markdown)

usb-serial-console.md

@@ -10,3 +10,50 @@ The terminal exposes the ChibiOS/RT Shell:
 
 ![grafik](https://github.com/eried/portapack-mayhem/assets/13151053/0642485a-ff13-4386-a1f4-4516d654d8dc)
 
+# Available Commands
+* help
+  * lists all available commands.
+* info
+  * shows the ChibiOS/RT system details.
+* systime
+  * shows the uptime in ms.
+* reboot
+  * reboots the PortaPack. This will also work on devices where the reset button is not working.
+* dfu
+  * reboots the PortaPack into DFU firmware upgrade mode.
+* hackrf
+  * Starts the original hackrf firmware to use the PortaPack as hackrf.
+* sd_over_usb
+  * Starts the [SD Over USB](SD-Over-USB) mode.
+* flash
+  * This is the [Flash Utility](Flash-Utility).
+* screenshot
+  * Takes a screenshot.
+* write_memory
+  * Writes arbitrary memory locations. 
+* read_memory
+  * Reads arbitrary memory locations. 
+* button
+  * Simulates a button press.
+    * button 1: Right
+    * button 2: Left
+    * button 3: Down
+    * button 4: Up
+    * button 5: Select/Enter
+    * button 6: DFU
+    * button 7: Rotary Left
+    * button 8: Rotary Right?
+* ls
+  * Lists files and directories.
+* rm
+  * Deletes a file.
+* open
+  * Opens a file for reading and modification.
+* seek
+  * Sets the current position inside the currently opened file.
+* close
+  * Closes the currently opened file.
+* read
+  * Reads n bytes from the currently opened file.
+* write
+  * Writes bytes from the currently opened file.