1. You just need rang.hpp from include directory, use it as #include "rang.hpp"
2. Check out the wiki & maybe glance inside test directory to see some usage
3. ???
4. Profit!!

• Use wrapdb to find rang dependency
• Place this code inside your primary meson.build - rang_dep = dependency('rang', fallback : ['rang', 'rang_dep'])
• Make sure to include rang_dep as dependency wherever you need it.

• search for rang package or goto - https://conan.io/source/rang/2.0/agauniyal/stable
• install the latest release - conan install rang/2.0@agauniyal/stable
• setup your conanfile.txt with -

[requires]
rang/2.0@agauniyal/stable

...

and CMakeLists.txt with -

INCLUDE(${CMAKE_BINARY_DIR}/conanbuildinfo.cmake)
CONAN_BASIC_SETUP()

ADD_EXECUTABLE(executable_name main.cpp)
TARGET_LINK_LIBRARIES(executable_name ${CONAN_LIBS})

• create build directory - mkdir build && cd build
• install package and build - conan install .. && cmake .. && make