README update with pyOpenSci review suggestions: repotatus badge; target-audience paragraph; Fortran/CMake dependency mentioned earlier on

[slayoo]

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[github-actions]

CLANG WARNINGS:

error: no input files [clang-diagnostic-error]
error: no such file or directory: '/github/workspace/files/*.cpp' [clang-diagnostic-error]
error: unable to handle compilation, expected exactly one compiler job in '' [clang-diagnostic-error]

CPPCHECK WARNINGS:

README.md:17:83: error: No pair for character ('). Can't process file. File is either invalid or unicode, which is currently not supported. [syntaxError]
For an outline of the project, rationale, architecture, and features, refer to: [D'Aquino et al., 2024 (SoftwareX)](https://doi.org/10.1016/j.softx.2023.101613) (please cite if PyPartMC is used in your research).
                                                                                  ^
clang-tidy-report.txt:3:101: error: syntax error [syntaxError]
error: unable to handle compilation, expected exactly one compiler job in '' [clang-diagnostic-error]
                                                                                                    ^
nofile:0:0: information: Active checkers: There was critical errors (use --checkers-report=<filename> to see details) [checkersReport]

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #396   +/-   ##
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  Coverage        ?   89.70%           
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  Files           ?       44           
  Lines           ?     2196           
  Branches        ?      111           
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  Hits            ?     1970           
  Misses          ?      160           
  Partials        ?       66           

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