Add a new concept page for Sidecar containers#43346

Merged

k8s-ci-robot merged 2 commits intokubernetes:mainfrom T-Lakshmi:sidecar-container

Dec 11, 2023

+180-55

Commits on Dec 1, 2023

added a new concept page Sidecar containers and revise details details of init containers and pod lifecycle.
T-Lakshmi
committed

Commits on Dec 11, 2023

Revise details for Resource sharing within containers
T-Lakshmi
committed