Add a koan teaching how to call C and Fortran code #5
Description
https://docs.julialang.org/en/v1/manual/calling-c-and-fortran-code/
https://github.com/functional-koans/clojure-koans/blob/master/src/koans/20_java_interop.clj
- Add test to koans
- Add solution
- Add documentation explaining solution