README.md: add 'features' and 'rlimit' packages to the overview
README.md: add 'features' and 'rlimit' packages to the overview

Signed-off-by: Timo Beckers <98c2d5a1e48c998bd9ba9dbc53d6857beae1c9bd@isovalent.com>

cilium/ebpf,cilium/ebpf