add designs/redfish-spdm-attestation.md

Propose a design for add Redfish SPDM support in BMCWeb,
with changes in phosphor-dbus-interfaces documented.

Redfish add schema for ComponentIntegrity
which

add designs/redfish-spdm-attestation.md

Propose a design for add Redfish SPDM support in BMCWeb,
with changes in phosphor-dbus-interfaces documented.

Redfish add schema for ComponentIntegrity
which allows user to use SPDM or TPM to authenticate device
identity and firmware integrity. It would be useful to add
SPDM attestation support in BMCWeb, which provides unified
interface for device security attestation in data center.

This design doc will focus on SPDM.

Change-Id: Id9674ce55230368a52652530cd93135678ef7a44
Signed-off-by: Zhichuang Sun <zhichuang@google.com>

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