Update Readme.md to use RegisterMediatR

[codecov[bot]]

Codecov Report

Merging #6 (57b1452) into master (f46c955) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #6   +/-   ##
=======================================
  Coverage   88.88%   88.88%           
=======================================
  Files           2        2           
  Lines          45       45           
  Branches        5        5           
=======================================
  Hits           40       40           
  Misses          5        5           

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[alsami]

Cheers!