Feature/add some figs to readme

[mori0091]

relative to #3
Added two figures to README.org

• a data-flow diagram of a built-in parser usecase.
• a data-flow diagram of a parser-combinator usecase.

[codecov]

Codecov Report

Merging #50 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #50   +/-   ##
=======================================
  Coverage   98.97%   98.97%           
=======================================
  Files          58       58           
  Lines        1853     1853           
=======================================
  Hits         1834     1834           
  Misses         19       19

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[mori0091]

Accepted.