updated README

README.md

@@ -2,9 +2,10 @@
 
 > [!NOTE]
 > **USBvalve Version 1.0.0**
+>
 > A complete rewrite of the application has been done:
 > - moved away from Arduino IDE environment, now the code is written for the [Pi Pico SDK](https://github.com/raspberrypi/pico-sdk)
-> - dependencies on external libraries has been reduced a lot
+> - dependencies on external libraries have been reduced a lot
 > - USB host support for Low Speed devices is now more robust (ATTiny85, EvilCrow, etc)
 > -  hardware and functionalities are almost unchanged, see the [notes](https://github.com/cecio/USBvalve#notes-about-bootsel-and-version--100) below for details 
 
@@ -219,6 +220,9 @@ Obviously you can also build your own firmware. To build you need the *Raspberry
 Basic recompile instructions:
 ```
 export PICO_SDK_PATH=</path/to/pico-sdk>
+
+git clone --recursive https://github.com/cecio/USBvalve.git
+cd USBvalve
 mkdir build && cd build
 cmake -DPICO_BOARD=pico ..   # or pico2 for standard build
 make -j$(nproc)