docs(readme): add custom node templating section

[caroso1222]

This is how it looks like:

closes #232

[codecov]

Codecov Report

Merging #250 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #250   +/-   ##
=======================================
  Coverage   92.13%   92.13%           
=======================================
  Files          25       25           
  Lines        1030     1030           
  Branches      146      146           
=======================================
  Hits          949      949           
  Misses         53       53           
  Partials       28       28

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[jacksonjunelee]

this doesn't seem to be working on my end. I am trying to customize my html