Documentation | feat: add clang-format docs and configurations (!203)

[Prashant Rahul (@prashantrahul141)]

Prashant Rahul commented on a discussion on eng/coding-conventions.md: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/203#note_143227

 >  Some of the above can be assisted by tool support. Feel free to add
 >  more tools, configurations, etc here.
 >  
 > -- `clang-format` -- TODO.
 > +### ClangFormat
 > +
 > +[ClangFormat](https://clang.llvm.org/docs/ClangFormat.html) can be used to
 > +automatically format files. RTEMS comes with a style configuration file for
 > +ClangFormat, it is present inside rtems.git as [_clang-format](https://gitlab.rtems.org/rtems/rtos/rtems/-/blob/main/_clang-format).
 > +
 > +#### Building and Installing
 > +
 > +RSB can be used to build ClangFormat from source.

Also, I have added the `clang-format-ignore.txt` file from the post in the same directory, should it be removed or maybe placed somewhere else?

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/203#note_143227
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