minor update for how_to_build_and_install.md

Signed-off-by: Takeshi Miura <m.takeshi1995@gmail.com>
YDLIDAR · Dec 27, 2022 · 2ada18b · 2ada18b
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diff --git a/doc/howto/how_to_build_and_install.md b/doc/howto/how_to_build_and_install.md
@@ -39,6 +39,7 @@ if you want to use python API, you need to install python and swig:
 In the YDLidar SDK directory, run the following commands to compile the project:
 ```
 git clone https://github.com/YDLIDAR/YDLidar-SDK.git
+mkdir -p YDLidar-SDK/build
 cd YDLidar-SDK/build
 cmake ..
 make