Add Ballerina styling to code blocks in README.md

[MohamedSabthar]

Purpose

$subject

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 31.23%. Comparing base (e685fa1) to head (cba5fe0).
Report is 15 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #15   +/-   ##
=======================================
  Coverage   31.23%   31.23%           
=======================================
  Files           5        5           
  Lines         397      397           
  Branches       97       97           
=======================================
  Hits          124      124           
  Misses        273      273           

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