Adding notes to ignore keystore-related files generated by Betamax.
Adding notes to ignore keystore-related files generated by Betamax.

felipecsl/walkman,felipecsl/okreplay,nuxusr/walkman,felipecsl/okreplay,betamaxteam/betamax,betamaxteam/betamax,robfletcher/betamax,felipecsl/walkman,nuxusr/walkman,robfletcher/betamax,nuxusr/walkman