### Add sys/resource header's implementation status ( #122006 )
#### Changes:
1. **CMakeLists.txt**: Added `sys/resource` to the list of documentation
directories.
2. **index.rst**: Included `sys/resource` in the documentation index.
3. **resource.yaml**: Created a new YAML file for `sys/resource` with
functions and macros which manages system resources.
This PR adds documentation support for the `sys/resource` header,
including functions and macros as per the latest POSIX standards.
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