Document log collector sidecar
Closes https://gitlab.cern.ch/webservices/webframeworks-planning/-/issues/1245
Rendered README can be viewed here: https://gitlab.cern.ch/paas-tools/paas-examples/log-collector/-/blob/dev/README.md
Closes https://gitlab.cern.ch/webservices/webframeworks-planning/-/issues/1245
Rendered README can be viewed here: https://gitlab.cern.ch/paas-tools/paas-examples/log-collector/-/blob/dev/README.md