* fix: validate code failOnThreshold

included snyk code validation on failOnThreshold matching codeSeverityThreshold
included test-args testcases on validation
included task-lib testcases on sample code json files
corrected README.md

* fix: validate snyk code failOnThreshold

initialized severityThreshold and codeSeverityThreshold to low

* fix: validate failOnThreshold

included validation of failOnThreshold matching or higher than codeSeverityThreshold
included test-cases and sample snyk code json files
updated README.md

* fix: validate failOnThreshold

formatted with Prettier

* fix: validate failOnThreshold

refactored condtion as function call

* fix: validate code failOnThreshold

revised ignore vuln expiry to quarter

* fix: validate failOnThreshold

revised task args testcases
refined README.md documentation
included task-lib testcase on severity threshold validation

* fix: validate failOnThreshold

formatted README.md with Prettier

* fix: validate failOnThreshold

revised README.md for conciseness