RTEMS | Update README.md adding more details and fixing links (!927)

[Chris Johns (@chris)]

Chris Johns created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/927

Branches: chris-main-patch-52074 to main
Author:   Chris Johns
Assignee: Chris Johns



## Summary


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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/927
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