[Code Style] [merge after #565] add pre-commit tool #566
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What is this
This PR introduces a plugin, pre-commit, which can check coding styles and format the code automatically.
Details
To install, please read doc in ./docs folder. In general, there are only two commands needed to be executed.
Then this plugin will automatically triggered before each commit. I have included several check items inside the .pre-commit-config.yaml. Now I use black to format Python code and clang to format C++.
If the commit cannot pass the check, just run commit again. The plugin will format the code automatically and then the second commit will pass.
The C++ code style follows ROS guidance: http://wiki.ros.org/CppStyleGuide.