add dcos powershell script
add dcos powershell script

add dcos_installation_path variable

dcos/dcos-cli,sis-tools/dcos-cli,mesosphere/dcos-cli,kensipe/dcos-cli,kensipe/dcos-cli,dcos/dcos-cli,kensipe/dcos-cli,mesosphere/dcos-cli,dcos/dcos-cli,Yhgenomics/dcos-cli,Yhgenomics/dcos-cli,kensipe/dcos-cli,dcos/dcos-cli,genome21/dcos-cli,kensipe/dcos-cli,mesosphere/dcos-cli,sis-tools/dcos-cli,genome21/dcos-cli,dcos/dcos-cli,sis-tools/dcos-cli