Update README to explain ports better.
Update README to explain ports better.

newrelic/sidecar,newrelic/sidecar,benoahriz/sidecar,Nitro/sidecar,benoahriz/sidecar,Nitro/sidecar,newrelic/sidecar,Nitro/sidecar,benoahriz/sidecar,newrelic/sidecar,Nitro/sidecar,benoahriz/sidecar