Add skeleton.rcp to help building custom RCPs based on Trace CompassSee README.md in directory below for brief instructions on how to updatethe skeleton for a custom RCP. The instructions are based on release8.0.0./home/eedbhu/git/org.eclipse.tracecompass.incubator/skeleton/skeleton.rcpChange-Id: I13f20ca548491971cfe4c76c93f2a2a1abcbe017Signed-off-by: Bernd Hufmann <bernd.hufmann@ericsson.com>Reviewed-on: https://git.eclipse.org/r/c/tracecompass.incubator/org.eclipse.tracecompass.incubator/+/195074Tested-by: Trace Compass Bot <tracecompass-bot@eclipse.org>Tested-by: Matthew Khouzam <matthew.khouzam@ericsson.com>Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>