README.md: Add examples of how to check bind;
JavaDetailCardActivity.java: Add examples of how to check bind;
KotlinDetailCardActivity.kt: Add examples of how to check bind;
TunaCard.kt: Create method to set valid for, check if bind has expired and get seconds to expire;
TunaRequestImp.kt: Copy card and set bind result;
RequestDataVOs.kt: Add atibute validFor;
TunaRequestImpTest.kt: Test if bind expired;
TunaSessionTest.kt: Remove unused test;
bind-card-success.json: Add attribute validFor;
README.md: Add examples of how to check bind; JavaDetailCardActivity.java: Add examples of how to check bind; KotlinDetailCardActivity.kt: Add examples of how to check bind; TunaCard.kt: Create method to set valid for, check if bind has expired and get seconds to expire; TunaRequestImp.kt: Copy card and set bind result; RequestDataVOs.kt: Add atibute validFor; TunaRequestImpTest.kt: Test if bind expired; TunaSessionTest.kt: Remove unused test; bind-card-success.json: Add attribute validFor;
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