RTEMS | README: Rename and convert to markdown (!1068)

[Kinsey Moore (@opticron)]

Kinsey Moore created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1068

Project:Branches: opticron/rtems:br5-readme.md to rtems/rtos/rtems:5
Author:   Kinsey Moore
Assignee: Kinsey Moore


## Summary

README: Rename and convert to markdown

This updates README to README.md for homogeniety purposes to allow
releases to be more consistent.

Closes #5494


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