feat: add graphql counter example

[chimon2000]

This pr adds a GraphQL counter example.

Work left (if wip):

n/a

Related Issue

Resolves #8

How Has This Been Tested?

Manual tests

Types of changes

• New feature (non-breaking change which adds functionality)

[codecov-io]

Codecov Report

Merging #8 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #8   +/-   ##
=======================================
  Coverage   76.56%   76.56%           
=======================================
  Files           1        1           
  Lines         192      192           
=======================================
  Hits          147      147           
  Misses         45       45           

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