Readme.md - worth adding additional dependency

[rpbostock]

This is a key build dependency (on Ubuntu at least).
sudo apt install libpcl-dev

[berkay1]

One thing to consider in src/PandarGeneralRaw/CMakeLists.txt there is a line
set (CMAKE_CXX_FLAGS "-fPIC --std=c++11")
which doesn't allow PCL to build because
/usr/include/pcl-1.10/pcl/pcl_config.h:7:4: error: #error PCL requires C++14 or above
7 | #error PCL requires C++14 or above

so, version info should be given in the Readme at least.