Add examples for Maven project into README

[OptimumCode]

This PR adds examples of how the library can be added to the Maven project as a dependency.

Resolves #280

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.76%. Comparing base (5ae9fc4) to head (39b0ce9).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #281   +/-   ##
=======================================
  Coverage   90.76%   90.76%           
=======================================
  Files         137      137           
  Lines        4073     4073           
  Branches     1087     1087           
=======================================
  Hits         3697     3697           
  Misses         81       81           
  Partials      295      295           

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[github-actions]

⚠️ Performance Alert ⚠️

Possible performance regression was detected for benchmark 'KMP JSON schema validator'.
Benchmark result of this commit is worse than the previous benchmark result exceeding threshold 1.50.

Benchmark suite	Current: 39b0ce9	Previous: 5ae9fc4	Ratio
macosX64.CommonAvgTimeBench.validateBasic ( {"objectPath":"openapi.json","schemaPath":"openapi_schema.json"} )	5847.217865269461 us/op	3028.1100194174755 us/op	1.93
macosX64.CommonAvgTimeBench.validateBasic ( {"objectPath":"openapi-invalid.json","schemaPath":"openapi_schema.json"} )	8127.790988617885 us/op	3797.9234993527507 us/op	2.14
macosX64.CommonAvgTimeBench.validateFlag ( {"objectPath":"openapi.json","schemaPath":"openapi_schema.json"} )	5519.718506504066 us/op	2930.5365618138426 us/op	1.88
macosX64.CommonAvgTimeBench.validateFlag ( {"objectPath":"openapi-invalid.json","schemaPath":"openapi_schema.json"} )	3.0075890390906386 us/op	1.9920554145869478 us/op	1.51
macosX64.CommonAvgTimeBench.validateVerbose ( {"objectPath":"openapi-invalid.json","schemaPath":"openapi_schema.json"} )	28234.460741463416 us/op	17750.351230107524 us/op	1.59

This comment was automatically generated by workflow using github-action-benchmark.

CC: @OptimumCode