added markdwon files to single modules

[Nerzal]

Continuation of PR #539

Fixes: #506

[codecov-io]

Codecov Report

Merging #630 into master will decrease coverage by 1.57%.
The diff coverage is 81.56%.

@@            Coverage Diff             @@
##           master     #630      +/-   ##
==========================================
- Coverage   87.17%   85.59%   -1.58%     
==========================================
  Files           7        7              
  Lines        1622     1708      +86     
==========================================
+ Hits         1414     1462      +48     
- Misses        124      156      +32     
- Partials       84       90       +6

Impacted Files	Coverage Δ
gen/gen.go	96.82% <100%> (+0.13%)	⬆️
schema.go	100% <100%> (ø)	⬆️
parser.go	80.84% <77.14%> (-1.71%)	⬇️
operation.go	89.85% <79.45%> (-1.7%)	⬇️
property.go	91.66% <84.44%> (-8.34%)	⬇️

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[ubogdan]

LGTM