Directories:
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The FreeRTOS/Source directory contains the FreeRTOS source code, and contains its own readme file.
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The FreeRTOS/Demo directory contains a demo application for every official FreeRTOS port, and contains its own readme file.
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The FreeRTOS/Test directory contains the tests performed on common code and the portable layer code, and contains its own readme file.
See FreeRTOS/SourceOrganization for full details of the directory structure and information on locating the files you require.
The easiest way to use FreeRTOS is to start with one of the pre-configured demo application projects (found in the FreeRTOS/Demo directory). That way you will have the correct FreeRTOS source files included, and the correct include paths configured. Once a demo application is building and executing you can remove the demo application file, and start to add in your own application source files.