Add description of JSON output folder

9 jobs for JSON_manual in 1 minute and 49 seconds (queued for 51 seconds)
Status Job ID Name Coverage
  Build
canceled #20189
build_binaries

passed #20190
build_doc

00:01:49

 
  Test And Pkg
skipped #20193
macOS
pkg_macOS
skipped #20191
pkg_source
skipped #20192
pkg_windows
skipped #20197
test_dynare++
skipped #20194
test_matlab
skipped #20196
allowed to fail manual
test_octave
skipped #20195
allowed to fail manual
test_old_matlab