Add Software.Asset interface

SoftwareInventory schema exposes `Manufacturer` and `ReleaseDate`
property.
[1] https://redfish.dmtf.org/schemas/v1/SoftwareInventory.v1_11_0.json

Change-Id: I0930ce0799ef14a288351424a07c8b59493885c2
Signed-off-by: Prithvi Pai <ppai@nvidia.com>
diff --git a/yaml/xyz/openbmc_project/Software/Asset.interface.yaml b/yaml/xyz/openbmc_project/Software/Asset.interface.yaml
new file mode 100644
index 0000000..6031c9a
--- /dev/null
+++ b/yaml/xyz/openbmc_project/Software/Asset.interface.yaml
@@ -0,0 +1,21 @@
+description: >
+    Implement to provide software asset attributes.
+
+properties:
+    - name: Manufacturer
+      type: string
+      description: >
+          This property shall represent the name of the manufacturer or producer
+          of this software
+      flags:
+          - readonly
+    - name: ReleaseDate
+      type: string
+      description: >
+          Release date of the software in ISO 8601 format, either as YYYYMMDD or
+          YYYYMMDDThhmmssZ.  Where 'T' is a literal character to separate date
+          fields from time and 'Z' is a literal character to indicate UTC. If
+          the time of day is unknown, the time of day portion of the property
+          shall contain `00:00:00Z`.
+      flags:
+          - readonly