Add initial README file for testing with SciTokens.
Add initial README file for testing with SciTokens.

opensciencegrid/htcondor-ce,brianhlin/htcondor-ce,matyasselmeci/htcondor-ce,brianhlin/htcondor-ce,brianhlin/htcondor-ce,matyasselmeci/htcondor-ce,opensciencegrid/htcondor-ce,opensciencegrid/htcondor-ce,matyasselmeci/htcondor-ce