Add support for writing QCSchema JSON

[awvwgk]

Following schema described in https://molssi-qc-schema.readthedocs.io/en/latest/auto_topology.html

[codecov]

Codecov Report

Merging #23 (ef208b8) into main (4702007) will decrease coverage by 1.83%.
The diff coverage is 0.80%.

@@            Coverage Diff             @@
##             main      #23      +/-   ##
==========================================
- Coverage   64.52%   62.69%   -1.84%     
==========================================
  Files          49       50       +1     
  Lines        4175     4297     +122     
  Branches     1357     1451      +94     
==========================================
  Hits         2694     2694              
- Misses        553      675     +122     
  Partials      928      928              

Impacted Files	Coverage Δ
src/mctc/io/filetype.f90	46.34% <0.00%> (-1.16%)	⬇️
src/mctc/io/write.f90	46.87% <0.00%> (-1.52%)	⬇️
src/mctc/io/write/qcschema.f90	0.00% <0.00%> (ø)
src/mctc/version.f90	0.00% <0.00%> (ø)
src/mctc/io/read/ctfile.f90	64.00% <100.00%> (ø)

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