Create DEVELOPER NOTES

source/f90/DEVELOPER NOTES

+This is the new version of inputs and uses yaml input files. There are differences to the original eelsin/bosin input files.
+
+*** YAML input ***
+
+The input of yaml files uses the package fortran-yaml-c from:
+
+https://github.com/Nicholaswogan/fortran-yaml-c
+
+This is a fortran interface to the common C-library libyaml.
+
+The package needs libyaml, gfortran and cmake and is build from sources with these commands:
+
+mkdir build
+cd build
+cmake ..
+cmake --build .
+
+Among others, it creates these files:
+
+fortran_yaml_c_interface.mod
fortran_yaml_c_interface.f90.o
fortran_yaml_c_types.mod
fortran_yaml_c_types.f90.o
fortran_yaml_c.mod
fortran_yaml_c.f90.o
libyaml_interface.c.o
+
+Search for and copy them to your preferred location. If you like, you can also remove the .f90 and .c from the names.
+
+Compile your source with a correspondingly adjusted command:
+
+gfortran libyaml_interface.o fortran_yaml_c_interface.o fortran_yaml_c_types.o fortran_yaml_c.o  -lyaml -L/opt/local/lib -o test test.f90
+
+Or do it in a Makefile.
+
+In the fortran file add
+
+  use fortran_yaml_c
+
+For the details of usage, check out example.f90 and test_yaml.f90 in fortran-yaml-c/tests.
\ No newline at end of file