Documentation | c-user: Add iodev documentation (!242)

[Aaron Nyholm (@eagleirony)]

Aaron Nyholm commented on a discussion on c-user/iodev/background.md: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/242#note_151912

 > +
 > +```{index} iodev
 > +```
 > +
 > +# Background
 > +
 > +The IO device API is a interface to access IO address spaces via a device node
 > +and a file descriptor obtained after opening the device node. A registered IO
 > +driver provide a mapping from a logical identifier to a specific address where
 > +an IO device resides. The API does not directly interact with an device hardware.
 > +An application can use a common identifier to a local IO address map for a
 > +device who's address can vary depending on a bus configuration or the BSP hardware.
 > +
 > +An example use case for this API is PCI devices. Different hardware setups have
 > +different memory bus allocations. This API creates a common interface for using 
 > +attached device BAR spaces via memory regions and interrupts via events.

Added definitions before acronyms.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/242#note_151912
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