docs: initial commit for survey document

Signed-off-by: Ramkumar Chinchani <[email protected]>

Author: rchincha

survey.md

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+# Landscape Survey
+
+This is a survey to document state-of-art in authentication mechanisms supported by image registry servers and clients.
+
+## Registries
+
+|Registry| Supported Authentication | References |
+|---|---|---|
+| dockerhub | | |
+| acr | | https://learn.microsoft.com/en-us/azure/container-registry/container-registry-repository-scoped-permissions |
+| gcr | | https://cloud.google.com/docs/authentication/token-types |
+| ecr | | https://docs.aws.amazon.com/AmazonECR/latest/userguide/registry_auth.html |
+| ghcr | | https://docs.github.com/en/packages/working-with-a-github-packages-registry/working-with-the-container-registry#authenticating-to-the-container-registry |
+| zot | | https://zotregistry.io/latest/articles/authn-authz/ |
+
+## Clients
+
+|Client | Supported Authentication | Supported Registry | References |
+|---|---|---|---|
+| docker cli | | | https://docs.docker.com/engine/reference/commandline/login/ |
+| oras | | | https://oras.land/docs/commands/oras_login/ |
+| regclient | | | https://github.com/regclient/regclient/blob/main/docs/README.md |
+| skopeo | | | https://github.com/containers/skopeo/blob/main/docs/skopeo-copy.1.md |