hand-tracking: Add --recursive flag

handtracking.md

@@ -66,7 +66,7 @@ This is left as an exercise to the reader.
 ### (Optional, only for DepthAI cameras) Get depthai-core
 
 ```sh
-git clone https://github.com/luxonis/depthai-core
+git clone --recursive https://github.com/luxonis/depthai-core
 cd depthai-core
 mkdir build && cd build
 cmake .. -DDEPTHAI_ENABLE_BACKWARD=0 -DBUILD_SHARED_LIBS=1 -DCMAKE_INSTALL_PREFIX=/usr/local -DCMAKE_BUILD_TYPE=RelWithDebInfo -GNinja
@@ -87,7 +87,7 @@ If you successfully installed ONNX Runtime and OpenCV, you'll get
 -- #    ONNXRUNTIME:     ON
 -- #    OPENCV:          ON
 <...>
-and 
+and
 <...>
 -- #    DRIVER_HANDTRACKING: ON
 <...>